Back Matter Source: The Scientific Monthly, Vol. 25, No. 5 (Nov., 1927), pp. ix-xvi Published by: American Association for the Advancement of Science Stable URL: http://www.jstor.org/stable/7940 . Accessed: 01/05/2014 11:29 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. . American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve and extend access to The Scientific Monthly. http://www.jstor.org This content downloaded from 130.132.123.28 on Thu, 1 May 2014 11:29:15 AM All use subject to JSTOR Terms and Conditions
Transcript
Back MatterSource: The Scientific Monthly, Vol. 25, No. 5 (Nov., 1927), pp. ix-xviPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/7940 .
Accessed: 01/05/2014 11:29
Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at .http://www.jstor.org/page/info/about/policies/terms.jsp
.JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range ofcontent in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new formsof scholarship. For more information about JSTOR, please contact [email protected].
.
American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve andextend access to The Scientific Monthly.
http://www.jstor.org
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SUPPLY Dnfg(~ DEPARTMENT BIUL IALSUPPLIES Open the Entire
Year For the classroom, museum or col- ''ST or !Zq lector. * @ First class preparations. C R > f E Send for niew (1926) Catalogue
No. 1. Zoological and Embry- ological material, Life His- tories and Habitat Groups. Catalogue No. 2, Botanical Material Catalogue No. 3, Microscopic Slides
Address all corresponderice regard- ing material and catalogues to:
GEO. M. GRAY, Curator
THE MARINE BIOLOGICAL LABORATORY Woods Role, Mass.
LARGEST AND FINEST PRIVATE COLLECTION of
RECENT MOLLUSCA IN AMERICA I wouldI like to place this collection of more than
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Froin my stock of duplicates, gathered from every part of the world, I can make up useful collections of moderate size, up to 3,000 species, if desired, at a very nioderate cost. If interested state definitely what you have in mind in first letter. Catalogues will be mailed free.
WALTER F. WEBB 202 Westminster Road Rochester, N. Y.
FOR THE
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ALBERT EINSTEIN
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A Debate on the Theory of Relativity Introduction by William Lowe Bryan, President Indiana University. Favor- ing the Theory: Professors R. D. Car- michael (Illinois) and Harold T. Davis (Indiana). Opposing the The- ory: Professors William D. MacMillan (Chicago) and AMason E. Hufford (In- diana). Price, $2.00. " The discussion is now offered to readers in a single volume and forms a welcome addition to the controversy."-Boston EvJlening Transcript.
Scientific Method in Philosophy
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Experience and Nature
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Send for Complete Catalog
The Open Court Publishing Co. Chicago 337 East Chicago Ave. New York 3I-33 East ioth St.
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Prepare 'Your Own Lecture Films First: Take any desired object or scenery upon standard motion picture film with the
Leitz " Leica " Roll Film Cantera; Second: Develop the film with the Leitz Developing Apparatus; Third: Print the negative film upon standard motion picture positive film with the
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Leitz Leica" Camera using motion pic- ture film of standard size.
Size: 5% X 24 x XI14 inch; Weight incl cartridges and film: I lb.;
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Equ,ipped with: tional and entertainment purposes. Its "Elmax " Anastigmatic Speed Lens 2 size being 8" high x 7" long x 4" deep, it
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New Telescope View Finder, for rapid evident how much of an advantage this ap- sighting; paratus offers over the rather cumbersome
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"One highly important feature of the stupervisory work of the state board of public roads is the prevent,ion of the use of unfit vehicles on the highways and the imposition of penalties for improper use.... The nmenace of improper operationl is equaled by that of cars which are unfit and unsafe for use. The peril of a defective car is no less than that of defective driving skill. One might as well encounter a drunken driver as one who is operating a car with defective brakes."
What is an unfit motor vehicle? Can a defective car be definitely measured?
The TAPLEY PERFORMANCE METER gives this measurement most simply
THE TEST: Drive on average level road at about 10 miles per hour (in high gear), depress the accelerator fully and as the car speedcs up note the maximum pounds pull reading of the Tapley Performance Meter. In genieral, this maximum reading will appear when the car reaches a speed of about 20 miles per hour (not above 25 miles).
Both the condition of the power equipment andl the accelerationi of the car are directly pro- portional to this pounds pull reading of the Tapley Meter. A car having less than 100 net pounds pull, in high gear, holds up traffic unduly, and is so out of condition, through negligence, as to be a menace to Public Safety. Should such a car be allowed on the public highways?
For the car owner to take more interest in mainitaining efficiency of car equipment is getting at the root of the problem for niore adequate Public Safety.
The TAPLEY PERFORMANCE METER is the greatest aid to car owners in maintaining nor- mal efficiency of the power equipmlenit, and in always keeping above the safe standard for their Brakes.
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Brake Testing Type for Officials Distributors for Messrs. Tapley & Company, Totton, Southampton, England.
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No strength is needed to operate < It is not necessary to move your the machine. You guide it by furniture. The Ponsellpolishes raising or lowering the handle. under tables, chairs and other ob-
jects without the least difficulty.
1 V Electric Machine Scrapes and Refinishes Floors
With it you yourself can put your floors in perfect condition and keep them so-costs but a fraction of one refinishing job
N OTa mere shining up of the old homely surface, but an entirely new surface. . .
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An amazing new machine which plugs into an electric light socket like a vacuum cleaner, and requires no more skill to operate, enables you to do the job yourself. It takes off com- pletely the old varnish or shellac... sand- papers the floor to velvet smoothness... vigorously rubs in coats of wax . .. then polishes the wax to a lovely luster.
The change in your floors astonishes you. They look like new. Not only that-but they stay that way, for the machine takes care of them forever after. A few minutes oc- casional polishing, an annual or semi-annual rewaxing (operations absurdly easy), and your floors become the constant envy and admiration of your friends.
In addition, the Ponsell Floor Machine takes care of your other floors. It gives
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Vlonsell Floor machine Co. S.M.10-27 220-230 W. 19th St., Dept. 2210, New York City
Please mail me complete information and prices regard- ing your Electric Floor Machine. This does not obligate me in any way whatever.
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Alas! A shattered test-tube has shattered many a disposition . . 0
Wliy will the cleaniers leave slippery, viscous accumulations for experimenters to slip on? Ye Gods! etc., etc.!!
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Tlis is Li'ving Autumn time is great when you live at
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Interesting Booklet on New York and the Majestic IIoteZ sent free on request.
Proprietor
and RESTrURANTS
2 West 72nd Street Entire block fronting Central Park
NEW YORK
The Hotel Majestic, Central Park West at 72nd Street, New York City.
WTithout obligating mne, please send me free Booklet on New York and Majestic Hotel.
Namne .
A ddress .............................................................. Scientific Monthly
N-> \ t>> >FIREPROOF
-NBroadway )AAT
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Double rooms with bath or shower 5.90, 6.99 and 7.99 Parlor, Bedroom and Bath ............. Ga19.99 to 12.99
Booklet and Map of New York UJpon Request.
For Reservations, Wire at Our Expense
PAUL A. McGOLRICK DAVID F. CULLEN
IIOTEL INEER VA Opp,osite Christian Science Church
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The accurate control of acidity and alkalinity by the hydrogen ion method has in recent years
The AB C opened up many new avenues I1 dfogen Ionf of progress in science and
IControge l on
industry. To meet an ever ct 1 1 1 1 11 growing demand for usable
cm l Ea \11 information on this subject, we have prepared this clear and comprehensive explana- tion of Hydrogen Ion Control
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and many others
Write for a complimentary copy. It is free on request.
LAMNOTTE M.~~U ~ ROULETTE COMPARATOR
Development of hydrogen ion control in many different fields has been aided in no small measure by LaMotte Comparators because they have made the application of this valuable control method extremely simple without sacrificing scientific accuracy. Patent Applied For
LaMotte Chemical Products Company 422 Light Street Baltimore, Maryland, U. S. A.
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Minot Automatic Rotary Microtome Precision Made Cuts Accurately to
for Precision Work 1 Micron in Thickness
The mechanical treei- sion, permctnitpy and Inherent Quiality of Bausch & Lomb AJiw'7o- tomes can be under- stood better when ooe considers the long ex- perience of the makers in the field of precision instrument manufac- ture,
M INOT Automatic Rotary Microtome is wheel which engages a pawl: amount of feed an ideal instrument for rapid serial is controlled by a cam graduated in single sectioning, cutting sections with ac- microns. The .icrometer screw runs in a curacy down to one micron in thick- threaded bearing which makes a positive en-
ness. It is regularly furnished for paraffin gagement under spring pressure. This allows sectioning only, but can be equippeL for cut- any wear to be automatically taken up: a con- ting small celloidin specimens as well. venient lever releases the screw instantly for
quick adjustment. The object holder is a 25 The automatic feeding mechaniwsm consists mm disc, adjustable to permit orientation for
of a micrometer screw revolved by a rachet any desired cutting angle.
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