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NYPE K POTENTIOMETER OUTFIT as used in PH measurements, with two Clark type of hydrogen electrodes and accessory glassware mounted on motor-driven shaking device. See Chapters XI and XII of Clark's "The Determination of Hydrogen Ions".

The uniformly successful and satisfactory operation of the Type K
Potentiometer with its accessories for Hydrogen lon Measurements
has made it a valued and important part of the equipment of many
laboratories carrying on scientific investigations or controlling pro-
duction processes.

"Electrometric Methods and Apparatus for Determining Hydrogen
lon Concentrations "-Leeds & Northrup Catalogue S75-will help
you determine whether the Type K Outfit is adapted to your work,
or whether some other combination of instruments would serve as

If your work leads you into problems of acidity or alkalinity determi-
nations, or of making accurate titrations under difficult conditions, a
reading of Catalogue S75 may mean time well spent. We shall be
glad to furnish the catalogue.


Electrical Measuring Instruments

4901 Stenton Avenue




By EDWARD J. KEMPF, M.D., Clinical Psychiatrist to St. Elizabeths Hospital (Formerly Government Hospital for the Insane), Washington, D. C.; Author of "The Autonomic Functions and the Personality."

762 pages + xxiii, 634 x 934, with 97 illustrations. Printed on beautiful India tint paper, and bound in silk cloth, with gold stamping.

This work on psychopathology is the first of its kind in the English language and differs decidedly from most current works on psychiatry and abnormal psychology. It does not proceed from the sterile assumption that the brain is the organ of the mind and the conclusion that, because in some cases undeveloped or diseased nervous tissue causes abnormal behavior, therefore in all neuroses or cases of abnormal behavior a diseased or inherently deficient nervous system or some obscure constitutional inferiority exists.

In the first chapter Kempf shows how the entire body is the organ of the mind; showing how its visceral segments produce normal and abnormal emotional cravings and mental states.

The second, third, and fourth chapters demonstrate how environmental influences distort the emotions, and the fifth chapter shows how all abnormal people are classifiable according to their dominant cravings and the manner in which they try to control them.

¶ Chapters six to thirteen discuss, with numerous case illustrations, how people develop into different abnormal types, how these types may be changed what causes them to change and how many again readjust to normal, and why others of the same type can never become normal again.

Chapter fourteen recapitulates the entire work for the student, writer, and lecturer.

Price, $9.50

Chapter fifteen discusses psychotherapeutic principles and what society must do for the individual to enable him to achieve a full normal growth and healthy personality.

An ample series of illustrations is used to explain the significance of common symbols to be found in dreams, delusions, hallucinations, fancies, art and ritual and why they are valuable for the emotions.

The book is fully and carefully indexed in order to bring together the more important similar features to be found throughout the


For those who have not the time of opportunity to make exhaustive, intimate, analytical studies of normal or abnormal people, but who need such case studies for their work as advisors, teachers, lecturers, or writers, Kempf's Psychopathology will fill an important need. It is presented to psychopathologists, physicians, sociologists, psychologists, teachers, judges, lawyers, custodians and directors of educational, military and custodial institutions to assist them to a clearer understanding of the abnormal or potentially abnormal individual.

The cases are presented fully and without prudish reservation. They will be of assistance to educators and advisors on sex education in their work of keeping normal people normal.

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PSYCHOLOGY: From the Standpoint of a Behaviorist


Professor of Psychology, Johns Hopkins University, Baltimore.

429 Pages. Illustrated. $3.00.


A TEXT FROM THE MODERN VIEWPOINT:-Every teacher of Psychology, whether or not he may favor the study of the subject from the objective standpoint, will read it with profound interest. From beginning to end a constructive attitude is maintained and, where possible, the material employed has been gathered by objective methods. No field, however, at present belonging to psychology, is neglected.

The text takes the position that psychology is a scientific study of human behavior, of the acts that man does through his original nature and hence apart from training, the acts which he can later do by reason of the putting on and retaining suitable habits. The importance of studying the individual in the light of his instructive equipment, the environment in which he has had to grow up, the system of habit which he has had to put on, and the stability of his emotional life are all emphasized.

The illustrations in the anatomical section have been prepared with great care and a number of the drawings were made under the direct supervision of Max Broedel.



Assistant Professor of Psychology in the University of Minnesota.

13 Illustrations. 322 Pages. $1.40 net.

The psychology of intelligence, the subject of which must form a large part of any thorough course in psychology, is not adequately treated in general texts. This volume covers the subject in a broad and systematic way and is a suitable textbook for courses in child psycholgy, mental diagnosis, mental development and education of children. It is of special value to teachers and school administrators, as it gives a thorough discussion of many of their fundamental problems. It gives the student an understanding of just how the most modern applications are made, in some very important instances, and a definite idea of the results achieved. The volume makes an excellent text for supplementing a course in general psychology or in any special branch where the scientific treatment of intelligence is regarded as important.

CLOTHING: Choice Care Cost


Illustrated. 289 pages, including appendix, bibliography, glossary and index.

12mo. $2.00.

Clothing, next to food, is a most vital problem. Heretofore it has been a neglected subject either for study or reading. This fact will emphasize the great value of this remarkable volume, to educators as well as to general readers. It gives complete information on clothing materials, their properties, values, and prices. How to ascertain by sight as well as by feeling the difference between fibres; between poor and good cloths; how to identify them; how to test their value for buying; and a general knowledge of the growth, manufacture, dyeing, and finishing of textiles in general. There are also chapters on the care, repair, and renovation of clothing; dyeing, laundering, and spot removal. This book will help solve the great problem of securing clothing to please the eye, to stand the wear of daily use, and at a cost within reason.



Major, Aviation Section Reserve, Formerly Officer in Charge of Experimental Department, Photographic Branch, Air Service, U. S. A.

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THE OUTLOOK, NEW YORK: "This thorough technical treatise may be used as a practical manual for class or self-instruction."

JOURNAL OF OPTICAL SOCIETY OF AMERICA: “This book is sufficiently popular to interest anyone who reads simple English, and yet contains most of the essential scientific principles and technical data which are of importance to highly trained workers and students in this field.... It closes with chapters on the future developments in apparatus and methods, applications to technical and pictorial work and to exploration and mapping, all of which discloses the sound judgment and practical imagination of the author."



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In times of emergency every hour counts

If you have a bottle of LOEFFLER'S BLOOD SERUM, DEHYDRATED, on your laboratory shelf, you can yourself prepare within one hour 1000 fresh moist slants ready to culture.

Simply weigh out the powder, restore the necessary moisture, with distilled water, dispense into tubes, coagulate and sterilize, according to our directions.

This gives a finished medium ready to use.

No time-consuming waits for the separation of serum from clot.

No spoilage. Dehydrated media keep at all temperatures. They are dry.



Carried in stock by principal dealers in scientific supplies



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Invention Anticipates Necessity

The research laboratory of the General Electric Company at Schenectady is dedicated to the electrical industry.

Its facilities for scientific research, almost coextensive with the scope of electrical industry itself, surpass in variey and extent the equipment of university laboratories.

Scientific experimentation proceeds hand in hand with the development of new devices and new methods of manufacture. The result of this industrial research-the cooperation of science and industry-is first, the increase of scientific knowledge, and second, the embodiment of this increment in better materials and new devices which ultimately make happier and more livable the life of all mankind.

General Electric

General Office
Schenectady, N.Y


Sales Offices in
all large cities


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