An Account of a BookDe quamplurimis Phosphoris nunc primum detectis Commentarius by Jac. Barthol. Beccario;W. WatsonPhilosophical Transactions (1683-1775), Vol. 44 (1746 - 1747), pp. 81-91Published by: The Royal SocietyStable URL: http://www.jstor.org/stable/104784 .

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a tigilt Otn tllis oUrcure Stllnjv2. I atnn aTith ney rrear RcfSed}

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tootig,Fefb I5t ?WXt fivitJJfgl FrXerld, I 74U5-6

vzJ d o t lgged S3azshlb SeJ!a>Xr

X4. Miles, ,. f ___ si

SVIt. Ar AccoXt of cz BooA ittitaled, De quatllplurilnis Phorplloris llunc prilnuln

deteEtis Cotzmentarius. SMSore Jac. Baro thol. Beccatio. Pristed in 40. a! Bo- lognia, I744. ExzraSec ard traJGaged firofn the Latin (y W. VWatSon, F R. - S.

Rmd Feb. 27.THE ingellious Autllor, in the \Rtork I745-6- 1 bcfore us, does not treat cxpre{ly of tllofe ProdutRions of the cllemical ArtX whicll we uEually call aPho@bori, but plircipally of filch Sub Rances} xvllcther natural or artificial, ssluich ialbib: tlle Rays of Ligllt in fucla Qlantities, arld in fucll a blanner, as to appear luminous fol a Time, even in abfolute DarkneEs.

Before I cnte.r llpOll tlle SubjeEt Matter of this Treatife, I tnuR take taaice of tlle Spparatas made uSe of ilo thefc Itlquirics. (tur Author caufed a woodcnBoxto lzenzadeX ]arDe enougllcitllertoSltin, or iland in uprigllt; yet nOt fo large but he rnight xvit h Eafc be carrice;l to any Place the nzoPt convenient

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a tigilt Otn tllis oUrcure Stllnjv2. I atnn aTith ney rrear RcfSed}

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tootig,Fefb I5t ?WXt fivitJJfgl FrXerld, I 74U5-6

vzJ d o t lgged S3azshlb SeJ!a>Xr

X4. Miles, ,. f ___ si

SVIt. Ar AccoXt of cz BooA ittitaled, De quatllplurilnis Phorplloris llunc prilnuln

deteEtis Cotzmentarius. SMSore Jac. Baro thol. Beccatio. Pristed in 40. a! Bo- lognia, I744. ExzraSec ard traJGaged firofn the Latin (y W. VWatSon, F R. - S.

Rmd Feb. 27.THE ingellious Autllor, in the \Rtork I745-6- 1 bcfore us, does not treat cxpre{ly of tllofe ProdutRions of the cllemical ArtX whicll we uEually call aPho@bori, but plircipally of filch Sub Rances} xvllcther natural or artificial, ssluich ialbib: tlle Rays of Ligllt in fucla Qlantities, arld in fucll a blanner, as to appear luminous fol a Time, even in abfolute DarkneEs.

Before I cnte.r llpOll tlle SubjeEt Matter of this Treatife, I tnuR take taaice of tlle Spparatas made uSe of ilo thefc Itlquirics. (tur Author caufed a woodcnBoxto lzenzadeX ]arDe enougllcitllertoSltin, or iland in uprigllt; yet nOt fo large but he rnight xvit h Eafc be carrice;l to any Place the nzoPt convenient

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[82 ]

tor his Obtervatio15s. In tkis Box was a little Win dow, in wllich a cylindrical Tube nvas fitted to ex- aAlyX that no Light could be ad£nitted but througll the Tube) in 5rllicll tllere sras an >?pparattxs fo adapted, that tC Perfon nvithin could pface any Ob jed:t proper for ObServation in fuch a Maslncr) as to xeceive as much Light as it could contaillX and tllen to turn it infl;antly towards lais EyeX nvitllout adtuiting the leaPc Ray of Light, befides tllat brougllt in by tlle Obje&* The Inlilde of tllis Box muPs be ablolutely dark ; nvitllout wllich Caution nzany of the Attempts would be unfucceSsful > becauSe tlle Ligllt in many of tlue Subjeds was neither very linely nor rery laR int,* Therefore it was neceGary alfio, that the Eyes of the ObServer {hould be as free as pofllble from the Itnprefllons of former Vilion: So that it were propcr tO make thefe Obrervations immediately after SleepX or tO kecp tlae Eye you intend to make uSe of nlut at lea{} llalf an Hour befbre you enter the Box. A Proof to know 5rhether your Eye is proo perly difpofecl, willbe expofing a Piece of white Pa- per to tTle T>irht in the Tulte} and then being able to perceive itS Form and Colour when turned tosrards you irl tlle Box.

Our Author dinsdes the Phofphori into feveral lillds; fonzc of xvlliche nline of themfelves naturally,, 2S tllc Glonv srorm and D-atcs ; or adventitiouny, as the Plclh of Anitnals, whicll moR probably atifes Eronl a lZegrce of PutrefaEtioll, fometimes too night tQ be obvious to our Set fes. ; Otller Bodies become lNillOUS by AttritionX Heat, the free AcceSs of Air, alldX la0ly, by itnbibitlg and retaining tbe Rays of TwightF Fthefe Bodies tllat are JlltM}nOllS by Attrition}

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[ 83 3 are anzongPr others, fome Diamond¢> and the Halrs of Animals; by Heat, ISeveral Sorts of Gems, and Moun- tain Cry Rals; frolm the free Acccrs of Air, tlle PDoJ> phori of Kraft and Hoanberg; from tlae Afipet} of Ligllr, the Bologtstar; luminous Stone, the Prepara tion by Chri/Mian Zdolphgs B4ldwin of Cllalk diS- folcd ill Spirst offNitre, as *Nvell as fenrcral otllers diScol ered by the late Monfteur i)8 Fk7t, xvho found} tlzat whatester Subflances 5rould7 by Calcination, be converted into a Calx, or whoSe Concrete, from a Solution in tllc Acid of Witrc, xvotlld bear Eire ezetlDle to become red-hot thefe ]3odies srere adapted to itubibe and retain Ii;>ht.

The greate(l Numbcr of 1Phnehoei re of tlle 1aRf mentionsd Kind, and tllefie are pritlcipally tI<c Uab jecAs of this rRreatiSe. Some of tllifc are xlat311als otluels artificial; but of tllee laR tllc Pleparatiotl is {o niallt, as not to chanre tlle Natllre of tllcir con Fltucnt Parts The natural Phn9t.70ri are citl<er Es:)flX seeetable, or anifnal. The follil areJ thoubll vcry diffcrcnt in Degree, fonac Sorts of Eartlls, wllit: Sawd, Lime Aoncs} AtdlaSitesX and {cvcral otlleL fi(urcd Stones, lnand Cry(:8.alsX Flints, bome Specics ot AgatesJ svllite Ar(enic; but n o fort of lMetalss metallic or fulpilureous Bodics, as Jet, Amber; ex cept tlle before-nlcntion'd Atfcnic. On the otller 11and, Salts imbibe l ir,hlt, prostided they are diveRed of earery nletallic Principle ) ottacrwiSe norX tliOUg pellucid as polllble. I^or tllis llea.<on, none of tllc Vitriols wilL imbibc Lit,llt; but otllcr Salts will, thot x^- ith a conGlderable Difference as tO Quantity; for Sal Getn. and Rock-Salt imbibe vcry little; Sea-SaltX if dra, anl in Cr[taSs, much lllorc and, in like

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[ 84 ] manrser, Sal. Sa>}R2onizzv.; naore yet, Sal {4thrtirzxm asld- Nitre; nvcak in the 74ron of the AllcicntsS a<d Alunz; btlt brigllteR of all ln Borax.

In the ve;,etable Kitl^,dom we find very fexy SP/!oF pkori;tllatot dly rorten Wood U xvcak, alld not lait- in;,; it sypears chielly upon thc Edges and Ineqllali tics of the Surface. lSut this -is moft remarkable irl; the rottcn \Vood of tlat Fir-tree, and Some otlJersJ rhere 1sl thz dark you fce ffiinint, Spots as bi:, as Tarcs; whcreas, in full Light, the xvhole Surface appears alike. Some fesv Barks are luminous, btle not conStderably So; but no Fruits, Seeds, or their Meals. Cotton appears sJery bright, and the CryEtals of Tartar; but fine Loaf Sugar appears the moft lunzi nous of all, botll writhout and within. Gwlus and ReRns retain no Ligllt.

There is a saR Vaticty of iE)ho/ltDori in the atlirllal Ilingdom, fucll as the lSollcs and Teeth s to thefe may be added tlle ShelSs of Filth, Egg-!hells, the hllmaN C4

sxlus,BezFov, and in svizatever Parts of Aninzals tlle ter- rerlrial Pritlciple is s ery predominant. But where there js a conEtdcrablc Quantity of oily Matter, as in tlle Hoofs, Hotns, and Fcatbers) no Liglat is manife.

The Atuthor, having gorle thronglu tlle natural PhoJWhari, ptopoScs forne Qucries concerning thern; of wllicll tlle firR iS7 In Wllat and how great a I>ight tlle Olzjcd ouglat to be placed ? He tried different Phothori in different Degrecs of Ligllt, and found thcnz itnbibc molt Light from thc Sun itSelf; next in Quantity, whesu thz Sky svas clcar 5 and tlle lcad isl forgy U'cathcr. Tllefe Fxpelilllerlts {hould be tnade in tile opcn Alr, and llot in a lloulc with the ;>laEs UZit;t3s)ws thui; bera*ure 1llarly Soclics appear

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[ Ss u 11uminous, when tluc Ligllt 11as n:01.;c clircflly to tllcar-, xatwicll will not has e that Apperlratzcc x^71ucll tllc Ltgllt 11as paScd tlltougll tlle GlaSs. Hc laRly tricd x^tllat Ligllt tllcy would inzbilze fronl s;ery bligllt Flame,^ and found tlwat AlabaPtcr itfelf; xvllicll is faturatcd more tllan ally Sub(tance lry tllc Sal1ls Rays, inlbibcd exccedin^,ly little. Tile llvxt Qucry is, how long thefe Bodies thould ren5ain ill tllC Light to be fuf- fiiently faturated > Four or five Seconds nvele found the utmo(t Lenrtlu of Tilne 1equired for tllat Purpofe The otller 9iuery is, IHonv lon^, tlle rcceived Li>llt xvill colltinuc in thcfc Pho/7uDori 2 It does not laAc the rame Time itl all; lout colltIllues alore or leSs, frotn 2 Seconds to 8, itl proportiotl to tlle Strenbtll of the CPho/9horgs, and tllc Q at tity of LiOllt tcSeistedJ

\Ale pats now to thote CPhoJqphoris xvllicll are pro- duced by Art; and, firR, to tIzcm wllich are nlade by the Maceration of Plants alone, and svitluout ally Fire; fucll as Thlcad, Litzcn Clotll) but) above all Pape The luminous Appcarance of tllis laLt is greatly in- creafed by Heat. This is confirmed by two Exper£- ments: tRhe firA is, by cxpoXing tlle Papcr, Epread upon an iron Grate, tO tllC nakcd Fire) yct not neal cnough to fcorch it7 alld tllcn Saying a Xtarln Btick thereoll to rctaitl the Hcat; by wllicll mealls it nvas obfervcd, tllat wilure tlle Paper xras not skrcclled by the iron Gratev it WAS nlOa luluinous; fo vllat, by the Li:,llts and Slaadcs, you tuit,ht diP{inguifla int tlle dark tlle Ima:,e of tnc iron Gratc a confidcrable Timeo Thc otilcr Expcritwnt is the Application of tlle la Fer to a Platc ot u urrn BraEs ; frconl wl-licll, whcn ia the dark, szou li;:lut vcrSt eafilv) I>y its b<>ill,^t, lcEs iah

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t}li2i0tXst diRi5guiRl tlle Margill of rllc Papertllat llad ¢wor beca w^armcd ly the Brafs.

T11e Autllor procceds tO takc notice of tluoEc iDo/* tr4iXr wthiclu lzecotne fo by tlle A&llqcance of FireX Bllt 1he Fire 11ere fpoken of is not grcat ellougll to eiiilelve their conllituellt Parts but only fucll as nzay a0ed t11: cxter:}al Parts of tlleir TexturcX alld tllat bllt gently; fo that thc ProccSs llere melltioned is onXy dryillg or toaltitlg. Far it is NOt tlle sratry or tllC aline Part in Bodies MJIlicil is torrefied; but tbe olca-

c,lllOLlS) wvheresvitll alany Xregetables} and moft Aw nals abound.

tthe white Flefh of AllimalsX facll as tllat of Cllickw cRs, becomes a PhoQhonls by roaRing} as svell as tke [elldons} and svlaatevcr Parts of Aninlals b¢couz Olutinous by boilin¢> fucll as Carpcnter's G1tc) ISu>-y* ¢laEs; to theSe may le addcd CheeteF Boncs} tIo they imbibe Lirllt NYitllOUt any Preparatioll h;ISe that Property in a mucll greater DeOltet xx I1ca uRllt, 8, their luminous Appearancc is luucll nzorc liscly El.t Realling has not tllis EDiA tIpon Ftatllets} HooSX Horns7 ol \571iites of Egt,s. Tlle fiIxac ()pcration} wllicll produlces fcvcral Phvekori fioln the anila lRingdom} ",ittes alfs3 feveral fiolll tllC tcgctablet Thus} by gClltly toaflill¢, Guals} as Mrrh} Gunl

TragaCallthx ' alld otllers} applr lulltilloU5} t0}

diScrcat in Degrces; and tlais rJi>t i5 clcarX in pro

portion to tlle gcntle Evaporation of tllcir aueot1s Part¢. EBy tllts TrcatnlentX Nuts of every IiindJ Ellfe, Corn, CoSce-INcrrics} Mcal) lJreacA) alld V9taScrs) alfo becorne SPthori. Turpetltinc} Allater and [O£uC Itefilzs, tcaloirc natre Fire bcfore tllcyr imbibc Lir,llt > 1o tllat votx mii .li->cf:} th6ul vf tllcir Acid} aze1 thcir

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U 87 g

light etllereal Oil, to lllake ttlelll appear lunzinous. Eut llere grcae Care tnuft be taken that tlley boil no lon^,er thata from bCitlg svllite thcy turn yellow; for if yoll procced longcr, your Labour is loft.

It is llecellary tI-at you ihould bc acquainted, tllat thore PhD#hori, svluich are ptoduced by Torrefad:tion, foc:)n lofc tlueir Powrer, stfllich, perllaps, neittler Time }<or a thorouglo IS)iffiolation of tlleir Parts, can deprisee tlle narllral ones of In gcneral, as long as tlle Phof- phori, gained by Torrefadtioll, prefcrve their Posrer, tlleir Light is naore {harp and llriking} ltut tlle llataZ ral, more weak. But thole that are gained by Cal- cination, and BaAdwyns sP/oJ9horxs} feem to pof-- fefs both the firiking Light of thofe gained by Tor- refaftion. and tlle weaker Light of tlle natural (Pho2^- phori: The latt tlley prefierve a lonO time, but the former is loA by degrees much fooner. Tlle well calcin'd Athes of Plants, or ratller their terreRrial Parts remaining after tllc Solution of their fixed Salts by wallsing, and neutral Salts) contiazue SPho@ori after marly Years. So tlwata as fir as we can judge} tlle luminating Power wllicll is gained by Calcinations tllo' not fO intenfe} continues perpetual; whereas tllat gained by Torrefadion always decreafes, and in a very little while is no longer stif1ble. Some even by tllis Method, continue tO inlbibe Light mucll 1<3"",er than othcrs. Gum Jrabir, which continlles loslgeR, laAs fix Days; Bread, not one; and Coffee9 onSy a fesm blinutesO HoweverX at any tinze} by a frcill TorrefaEtionX you nlay recover thefe languid vPhofphori; ill whicll Property elley lavc ,rcat Likencfi to tile Bolognian StoneX and other YvhoJ}/ori preparecl T;y Art. The ThoJ9hori gaincd by lorrefadtf3n) as

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[ 88 w.cil as that of 3Glegna) NSill not in libe Ligllt ntluilW tt-cF .1S*d NVEtM; and tllis laR docs not appear fo 1uw *8*ilous allen firA preparcd) as tllell it llas bccn ro

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iO11)£ tttElC.

[lle llatural Pkagphvri do llot diffier only in t1Xe 52t-QrCw nlet,tion'd Particulars) but alb in the Colotlt ot tllc Ligllt itfelE Tlle Ligllt of the natural gene ra';y alrpcals citllcr pcrfedly brigllt) or Somesvllat ill- ;;lilail, to ycllow: ttlle artiiicial pr-oduces a re<S, and t)nctitnes a hroutll IJ;RI1t; bllt tllere are fomc Exr ^t5gtlOllS t0 both thelc Rulcs. From tllefc diffcrcllt N^parances, tllc Autl or conjeEturcs, tllat tllc2c arc tWSo strts of Fire ariGng from diffErent Principlcs; nst¢ tllat ill eorrefied Subtlances} fiOIll a fiUIplltlrC0t15, and tllat of tlle natural} from a terrcflrial Prillciplc.

In ob6crvinc>, a -I>iwce of Lapis liti> NYlliCll Xvas totlgis allel ullequal 011 its ConNrcx Sidc? rlnootll alld

lOtB¢Wllat pX31itllCd OI1 the collcave s 1 c {oulld) to llis Stlrprize, tllat tl e rouDll Sidc was lumillotls, and the {;nootb ont not. He was very defirotls of in SCtliatillr tlle Caufc of tllis Appearancc. 11c rcInetn cr'd tll.lt loIne polilk d Marbles did not imbibe Liglltt or very littlc, and tllat at ttlCir Edges ; but, havillg loR their Poli{h} tllcy (lid 3clSit and retXlill it. He tllcre- fore COtl jvdiurcst tllat Iledics, accordinD to tllc Dil: fipofition of vllcir Surficcs tor tbe l?KmRedioll of the Cl.iOllt, eitller ftl1Rr or prCSCllt itS EntltJllce illtO tllelll.

Sf tllis PoStioll 11olds good ill thc lteflcdioll, x^lly toull it llOt nVitll rct}ard to tllC ltefrslitiona Our Autllor pro{tlccs tWo lixperitllents) nailicll 11e apprc- hCt1dS not forciXrn to tllc prc62ilt Liulptlt; butisyct -vuaking otlacr<, for his ftlrtllcr Sati<ta<.alel. 19c ex- FoScd a C,1a{s Bottlc full ot Artll*\Vat.r {o the; IJ18>h:

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L 89 snd, as fooll as pofl1blc, obrcrvcd it in tlze dark. As 11e eJfpeded, it inlbibcd no Li;,llt. Upon pouri£lt:, illtO it gOlilC Oil Of Tartar, ir bccame turbid and NYiliti9 from tlae Wcll-\N'ster bei1lg ufua13y iLIlprcg- OatCd xvitll calcarious Mattcr. IJpon olcrvilz, it TI\C11 ill tllc darl) aftcr 11asillC, bwen cxpofed as bctore, it retaitled cn£)llgll of a palc Ligi£ to diAiri:uiM the Sla,pe of tTle Bottle. Iv1 a 1Sott' of Raill-lMater he diflolved fome Talc; wxtlliclo Stolle, by rubbin^>,, will di jlolsre in Utatcr as Salts do, withollt rcndering it opaque; tO tiliS 5OtUtiOll 1lC added Oil ot Tartar, alid tilis Mixttltc x^7as luluinous as tllc pre ccditzg. Ile tilereforc collclvldcs, tloat fo long as cartlly Cczipuicles are vely finall, fcparate, and agree- ing ill their Surl-accs Witll the \Matcr in NYlaiCll tilCy floar, tlley readily tranf:lmit vile Light thcy recciste;

fot xntilicil ReaSoll it is ilupotilblc thcy Aould letai Ligllt elzotlgll to appcar luminotls io tllC daik. But, by tloe AffuSioll of the faline Plinciple, t11c eartlly Colptlrcles unite nvirll tllc \Xater atld Salt; and fronl tllc Ullioll of [llelc Plitlciples tlae NIixtule gronvs tllick, x^hercbfr the ready TlanEnaidion of Ligilt is prcs elated ; fo tllat, if tllis Mixture is withotlt Colour} or ally thillg metallic, tlle Liglzt will be &opped loag enough tO be viSble in thc dark. But if, inAead ot Oil c)f laltar) you add Stlgar of LeadX ttlC Mixture will bc tvlrbid, but letain no Liglur. In thefe txvo Experimcuts tlle Water becomcs a CPho@torgs.

(SclllS, Cryftals, anct GlaSsX x5zlletller wllole, or ponvdcr'd cser fo fine, rctairu no Lit,lat; rO tllat Ilei-

tller tilcir l rallfparency nor \XthitclleSs contribtlte to tlacir becoming lunzinous in tllC da.k. Of fcveaal l:)iaIlaolads} iz all Appcarancc pclt<dly the A.Rsnc fsDt-ale

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E 9o } verc stel4y lurnitlotl¢> orllers not at ail. C)f rnany opaque Subita £1cCs, wilcther rovtgh, pol ithe1> or fiXcly ponvtlcrd, lotnc were ltilllinotis, others not. Sotilat it SppCal4S, fllat not only tllc extcrlzalX but t-iae in- tcLtRaI tcxttlre of BotSizs alro, may co1ldtlce lollle vlanies to tllcir beill lvnil:<ous.

FrOlll t;l; precedinr Experilllent.<) tlle Avlther is lcd to lnalc foluc Iaquiries into tllc Caule of tllis IUlUi 110t1S 2AppearaIlce; and takes noticeX tllat allnoll all

iBcdicsX lzy a proper frcattlaclle, llave tilat Power of faitling in the dark, xs71aicll, at firR, was ttlppofied to bw tlls Plooperty of one, and afternvards only of a few lIoxv this is lDrou.lut about, is not stery cafy to folve. It we [uppofc with fome (tO \^tlliCil our Autlsor, in fcveral PJllages of tllis \57ork, fieems llot averfc), tllat tllc L¢ght frollz a ltltminorls Body entcrs and abides in tlae 'Phofiphori) nve ffiall find i:omenvhat ncsr to ad^ mire in Ligllt itrelf. It is no nesv Optnion, that this fluid conStits of scry fine ParticlesX svllich are cont- ntlally dalted fortil frolll a luminous Bocly) in a11 Di- reEtiQlls NVitil a Vcry breat Vclocity: But it llas oy nobody b2cn laid donv1z laitllcrtoX tllat tllcre Particles arc not ctiffiolvcd by tlle Vlolcnce of tllcil A^,itatioll, not dirpcrf<lX nor itllmcdiately ccatc tO exiSt; but i;lJliflc {lilla and adllere to xxhat Botlics cotne in tllcir \May, as t1cat docsX alld arc tllc Ctltllcs of O:lottrs. If t}aercfore tlle Particlcs of Linllt al^c not dillolvcd as toon as tlacy- are clllitteii fiolal a r.ldiant 13od)t, but continue fomc titnC, NYtlalt el5c is rcquired) but rllat xve allow its zNtalorphcrc to cvcry ltzi itl App<arancc > If tllc: Pho/4Tffiori {tine NYitll a boltvxrcd Li:,lat, but flOt NSitll ti.eir OWt1t and tllat only xr1Rctl put in ASlo- iionX ane;l fir<u by t11c ltays of a {laitlizt, Body, xvIlich

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[ gr ] fOtNC Expertn1cnts fcctn to collfirm) tllcll orller ncnY DCaritlcS \&7ill A£ic. TIlcre muR bc tllcn a 11idkicll} a fecrct PrincIple in Bodics, to be li:,lltcd tlp by tlliS tnoft fubtlc Firc. Tllere sxzill be in tllc Ulliverfc a certaitl perpcttlal Firc frotil tlldl^: PRZ. %%ttor ; tilc Alat ter of x^?llicll, tilo' conllal.tly <Aillip>.tcd lJy burnilz> does not xvaLle ellouglu to lDe ols ious tO our Sctilcs.

I canllot conclude nzy Exttad of this Autilor, svith- out Iliciltionin, tlat 11is RVork is the Rcfiult of a great XJaricty of vcry ingenious ObSerarations, and of Experiments tlla.Re wtitil the utnzoA Accuracy; to ss llicll I nzzy add, thae nvllerc-cs er he nzakes any Con- jedure concerning their CauSes, he does it svith all poilible Deccncat, alid Submifl ton to tile Judgment of tile Learned.

XVIII. X Letter f>*osB the Rev. Dr. Miles, F. R. S. to Ilfr. Baker, F R. S. concerntg the EleSricity of Water.

Wear SitX P¢ndFeb. 2j* 3 E GI N xvitll a Refolation tO be lNC1'-

{;45-6. 1 citul alld hope to keep itX cfpeciallp as I perfccute w ou again fio loon ; and indeed tlle true Rcaton of my doing it nonv, is that tllis might reacll yoal bcfore 1 haste the F.1vour of another from you, as it relates to ali Article in tlly laR *.

1 tllis Atternoon, on rcfledincr afreffi on Monlieur L'XllsnanSs Experitnent +} 1efolved to nzake tlle folZ

A1 < lowinJ, _

[ gr ] fOtNC Expertn1cnts fcctn to collfirm) tllcll orller ncnY DCaritlcS \&7ill A£ic. TIlcre muR bc tllcn a 11idkicll} a fecrct PrincIple in Bodics, to be li:,lltcd tlp by tlliS tnoft fubtlc Firc. Tllere sxzill be in tllc Ulliverfc a certaitl perpcttlal Firc frotil tlldl^: PRZ. %%ttor ; tilc Alat ter of x^?llicll, tilo' conllal.tly <Aillip>.tcd lJy burnilz> does not xvaLle ellouglu to lDe ols ious tO our Sctilcs.

I canllot conclude nzy Exttad of this Autilor, svith- out Iliciltionin, tlat 11is RVork is the Rcfiult of a great XJaricty of vcry ingenious ObSerarations, and of Experiments tlla.Re wtitil the utnzoA Accuracy; to ss llicll I nzzy add, thae nvllerc-cs er he nzakes any Con- jedure concerning their CauSes, he does it svith all poilible Deccncat, alid Submifl ton to tile Judgment of tile Learned.

XVIII. X Letter f>*osB the Rev. Dr. Miles, F. R. S. to Ilfr. Baker, F R. S. concerntg the EleSricity of Water.

Wear SitX P¢ndFeb. 2j* 3 E GI N xvitll a Refolation tO be lNC1'-

{;45-6. 1 citul alld hope to keep itX cfpeciallp as I perfccute w ou again fio loon ; and indeed tlle true Rcaton of my doing it nonv, is that tllis might reacll yoal bcfore 1 haste the F.1vour of another from you, as it relates to ali Article in tlly laR *.

1 tllis Atternoon, on rcfledincr afreffi on Monlieur L'XllsnanSs Experitnent +} 1efolved to nzake tlle folZ

A1 < lowinJ, _

P , 9. ripra, P , 9. ripra, + P 59 fwSra, + P 59 fwSra,

This content downloaded from 195.78.108.152 on Tue, 13 May 2014 19:15:23 PMAll use subject to JSTOR Terms and Conditions