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Recent Important Works on
Home and Community Hygiene

FIRST AID IN EMERGENCIES

By ELDRIDGE L. ELIASON, A.B., M.D. Former Lecturer on First Aid in Emergencies, University of Pennsylvania.

106 Illustrations. 215 Pages. $1.75.

The best and most compact book, with its convenient thumb index and illustrations, with which to meet all emergencies arising from accidents or sickness. It gives quickly understood directions, with special chapters on surgical principles and supplies, bandaging, hemorrhage and drugs.

HYGIENE OF THE EYE

By WILLIAM CAMPBELL POSEY, A.B., M.D. University of Pennsylvania.

120 Illustrations. 344 Pages. Octavo. $4.50.

None but an expert could give so effectively the essential points as to the structure of the eye, its care and protection in health and treatment in disease, with the intention of striking at the root of the large percentage of eye troubles and blindness in the American population. It is an authoritative and practical guide to the prevention and conservation of eyesight under all conditions and as such will prove of practical value to the members of the medical profession engaged in industrial work.

HOME AND COMMUNITY HYGIENE

By JEAN BROADHURST, PH.D. Teachers' College, Columbia University.
428 Pages. 1 Colored Plate. 119 Illustrations. $2.50.

"This is nothing less than an encyclopedia of hygiene written in the simple style which makes it understandable and interesting to the most inexpert layman and yet so scholarly and authoritative as to command the respect of the scientific physician or sanitarian. For the professional library, for the school, for the family. It is to be commended in the heartiest and most unhesitating terms. It is of exceptional interest and practical value."— New York Tribune.

MOUTH HYGIENE

By JOHN SAYRE MARSHALL, M.D., Sc.D. Syracuse University.

Second edition, revised. 22 Illustrations. 12mo. $2.50.

The importance of mouth hygiene to public health is now receiving the attention it deserves. This little handbook covers the subject thoroughly. The facts given and the suggestions made are of the greatest value to those interested in community hygiene as well as to individuals. The author points out the connection between oral diseases and immorality, drunkenness, crime, and insanity.

ELIASON'S PRACTICAL BANDAGING

By ELDRIDGE L. ELIASON, A.B., M.D. University of Pennsylvania.
Crown Octavo. 124 Pages. 155 Illustrations. Cloth, $1.75.

All the recognized classical bandages in common use are described. The exact amount of material required is shown, how to roll, starting, requisites of a bandage and it's ending-in a word, it is the most complete and practical work in existence describing the various bandages and dressings and their application, including Adhesive and Plaster of Paris Dressings.

PRINCIPLES AND PRACTICE OF MILK HYGIENE By LOUIS A. KLEIN, V.M.D. Professor of Pharmacology and Veterinary Hygiene in the School of Veterinary Medicine at the University of Pennsylvania, and Dean of the Faculty.

41 illustrations in the text. Octavo. $4.00 net.

It presents systematically, in concise form, the facts and principles which are of importance in the practice of milk hygiene and describes how they may be applied in the inspection of dairy farms and in the examination of milk. It will prove of service to dairy inspectors, milk examiners, public health officials, and others interested in the production of wholesome milk.

-Write for Descriptive Circular

J. B. LIPPINCOTT COMPANY

Publishers

Philadelphia

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MCGRAW-HILL

Agricultural and Biological Publications

DR. CHARLES V. PIPER, Consulting Editor

The success of McGraw-Hill Books on Agricultural Engineering tempted us into the broader field of Scientific Agriculture and Biology.

The result is this new series which aims to meet the present-day need of more advanced and scientific agricultural and biological texts.

PRINCIPLES OF ANIMAL BIOLOGY

By A. FRANKLIN SHULL

Associate Professor of Zoology, University of Michigan
With the Collaboration of

GEORGE R. LA RUE and ALEXANDER G. RUTHVEN
University of Michigan

441 pages, 6x 9, 245 illustrations, $3.50

This book presents a general course in animal biology covering physiology, ecology, taxonomy, geographical distribution, paleontology and evolution, as well as morphology. It embodies the material and methods that have been developed in the course in Animal Biology at the University of Michigan.

LABORATORY DIRECTIONS IN PRINCIPLES OF ANIMAL BIOLOGY

81 pages, 6x9, $1.00

GENETICS IN RELATION TO AGRICULTURE

By E. B. BABCOCK

Professor of Genetics, University of California

and R. E. CLAUSEN

Assistant Professor of Genetics, University of California

650 pages, 6x9, 239 illustrations, 4 colored plates, $4.00

A compact, authoritative textbook on the principles of genetics and their practical applications. Professor Conklin, of Princeton, says, "It is in all respects, I think, the best textbook on this subject in the English language.

GENETICS LABORATORY MANUAL

56 pages, 6x9, 14 illustrations, $1.00

Send for copies of these books on approval

MCGRAW-HILL BOOK CO., Inc.

239 West 39th Street

NEW YORK

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The Kenotron, a product of the General Electric Company's Research Laboratory, is a rectifier providing very high voltage direct current for spectroscope work, to operate small discharge tubes and for testing the dielectric strength of insulations. It is also an important part of the Cottrell Electrical Precipitation Process for collecting, recovering or cleaning fumes and gases present during chemical or metallurgical processes. The Kenotron depends for its operation as a rectifier upon the fact that when one of two electrodes, placed near each other in a high vacuum, is heated to an incandescent state, current can flow across the space between the electrodes only when the incandescent electrode is negative, i. e., acts as a cathode.

For large capacities Kenotrons may be operated in groups of four. Such a group has a capacity of 200 milli-amperes direct current, at a maximum voltage of 100,000, corresponding to an effective value of about 71,000 volts, a.c. (about 15 kw.). Greater capacity may be obtained by connecting additional units in multiple with the initial set.

For further details write our Schenectady (N. Y.) Office

General Electric

General Office
Schenectady, NY

Company

Sales Offices in
all large cities/

35B-29

AMERICAN STANDARD

HAEMACYTOMETERS

WITH LEVY COUNTING CHAMBER

The Levy Counting Chamber was announced in November, 1916, was patented January 31st, 1917 (U. S. Patent No. 1,214,331, and was awarded the Edward Longstreth Medal of Merit by the Franklin Institute, Philadelphia, December, 1917

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No. 29984. American Standard Haemacytometer with Levy Counting Chamber with double Neubauer ruling THE LEVY COUNTING CHAMBER was the first dependable Haemacytometer Counting Chamber made in the U. S. and continues to be superior in several important characteristics to any chamber yet made either in Europe or America.

It provides an increased visibility of ruling when the chamber is filled, unequalled by any rnling of European make, and a new method of construction of the parallel form of cell (first suggested by Bürker) which entirely avoids the cemented cell of the Thoma or Bürker construction with the attendant danger of separation from the slide.

The parallel or open form of chamber permits the filling of the ruled area on the cover glass by capillary attraction after the cover glass is in position on the slide, and provides a more uniform distribution of the corpuscles than is possible with the Thoma or circular form of counting chamber which is entirely closed by the cover glass.

The dimensions of the ruling and the depth of the cell are guaranteed to be within the tolerances established by the Bureau of Standards and, when so ordered, Counting Chambers are furnished with Bureau of Standards certificate at an additional price.

29991. American Standard Haemacytometer, complete with Levy Counting Chamber with Neubauer ruling, with two pipettes, in leather case 15.00 29983. American Standard Haemacytometer, as above, but with Levy Counting Chamber with double Neubauer ruling

29990. Levy Counting Chamber, with single Neubauer ruling 29965. Levy Counting Chamber, with double Neubauer ruling.

Prices subject to change without notice

18.00

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7.00

10.00

Copy of Supplement No. 53, "American Standard Haemacytometers" sent upon request

ARTHUR H. THOMAS COMPANY

WHOLESALE, RETAIL AND EXPORT MERCHANTS
LABORATORY APPARATUS AND REAGENTS

WEST WASHINGTON SQUARE

PHILADELPHIA, U. S. A.

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