equations The idea in t o have the teacher grade the pupil on the actual chemistry content of the written report. and not on the quality of his drawings nor on the nearness of arrangement, ete. The first pages of the manual have Lists of the general directions for treatment of accident eases, and lists of apparatus illurtratted with excell;ot drawings. These are ail good features. ~ l t o g e t h e rit is a very commendable eombination of manoal and note-book and ought to render extensive service in the schools.
Lecture and Laboratem Experiments in Phydcel Chemistry. HamY S. V A N KroosrBR, Ph.D. second Edition of Lectore Demonstrations in Physical Chemistry. The Chemical Pu~lishing Co., Baston,Pa., 1925. x 274pp.,91 figures. 13 x 19 em. 63.00.
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~ r ~ f e s svan o r Klooster has brought together in this book three hundred and sixty experiments in general physical chemistry most of them expressly adapted for use in lecture demonstrationo. The book is isued as the second edition of the "Lecture Demonstration in Physical chemistry." "The chapters on catalmii. deetra"hemistry and ionic theory, solubility, colloid chemistry, and adsorption have been enlawed, and two new chapters dealing with radio-activity and miscellnneovs experiment3 added. About one hundred mew experiment3 have been described." (Preface.) The experiment. cover most of the s u b j s t s commonly inclvded in elementary physical chemistry, as well as many of the topies that may well be used in eonneEtian with c o m e s in genera1 chemistry. The directions are given with =urnrient detail to be really u d u l , and the numerous to original sources arc a valuable feature of the work, an anyone who has had mveh experience in trying to demonstrate experiment3 from second- and third-hand descriptions will agree. The author does well to emphasize the importance of Lecture demonstrations in physical ehemistry, and it is indeed strikiog, as he suggests, to note how large a proportion of the experiments is due to the famous teachers of the subject. The book under consideration should be a great aid in .timulating further efforts to improve the teaching of physical chemistry. Because of the increasing prominence of physical chemistry in general-chemistry courses, the book should be of value also to teachers of such cIas3es.
Thi. little book is evidently written for Dr. Hendel's cl-es in Hunter Collese. I t contains eleven chapters; Weishing, Simple Gravimetric Principles, General Theory of Gravimetric Procedures. Practical Analysis of a Dolomitic Roek, Volumetric Methods and Apparatus, Alkalimetry and Addimetry. Oxidation and Reduction Methods. Iadimetry. Electric Methods, Errors. and the Precision of Analytical Results The selection of samples discussed is conventional. As a text-book, it could well be supplemented by a ryrtematie course of Lectures. The last chapter of the book on errors and the precision of nnalytieal results. though brief, is t o be commended. I t is t o be hoped that in later editions, the book may be considerably expanded. Vtnos L m n m How to Teach General Science;Notea and Suggestions of Practical Aid to Every Sci&ce Teacher. 1. 0. P a r w ~ Professor , of Science Education in the wiseonsin state Normal School a t Osbkorh. Caalc-Pierce Press, Oshkosh. Wir., 1925. riii 194 pp. 13 X 19 em. $2.00.
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Thi. book wan brought t o print after having been taught in manuscript form t o more than two
hundred teachers. one cannot read it without noting a refreshing directness and eonclena. of style, and a richnus of suggestion that ir inrpiring. The book ir closely written and splendidly organized, and equipped for the utmost practical aid of any general science teacher from youngest to oldest with abundant up-to-the-minute topic references. The author briefly surveys the development or schools and teachins to clear sway . any . eonfurion as t o the real place of general science in seeoodary e d u ~ a t i ~ oThen . follows a juntification of his theories in citations from the findings of modern educational poyehology and in theeonelusions of the N. E. A. special committees an to broad aim=. which the author simplifies and sum* up for genera; science teaching as: "In the grades, t o furnish experience. . . . s.tools for later understanding . . . I n the Junior High School, to dircover dominating interests. . . . . . I n the Senior High School t o carry his dominant interests to intellectval independence:' General science should not be thought of aa a reservoir of unlimited facts of "Science" (and everything else), but as a fund of praefieal appealing matter, rigidly selected from the stand-point of accepted aim8 t o be the vehicle for teaching some fundamental principles of science, habits of accuracy and ob.ervation, and far training in "how t o study and how t o learn." G. H. C A ~ L B D O B Coreideation of legitimate svbjcct~matter leads to the conclusion that "an ideal text-bwk for universal use is imposriblc:" but the scheme Qoantitsthe bnalmis. J m s s M. HelroRL. Assistant Pmfesror of Chemistry. Hunter Colle~e for three levels of subject-matter seems t o o U a a much-needed solution of this want. The chapof the c i t y of New Yrnk, oinn & company. ter on general science references is complete, and Boston, Mas.. 1925. vi 134 pp.. 13 X 19 "Special Teaching Aids" appears to be a veritable em., 51.40.
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