mechanics which have been so overdone in some recent "workbooks." The experiments covered are those usually found in similar laboratory manuals. The text is divided into forty-six experimental units, followed by five units on Review of Equations, Chemical Arithmetic, Biography, Table of Common Substances and Alloys, and Review of Important Terms and Laws. The appendix contains seven items of the usual referential nature. "demonstrations witnessed This b w k tries to "integrate" by the student, individual laboratory work, classroom work with the textbook, and reference work in the library." The preface says, "Each unit begins with experiments," and is followed by "Observations and Questions on the qxperiments" and "Conclusions," but this order is not carried out consistently in all units. Some units include also "Supplementary Exercises" and "Optional Questions" far the more gifted students. The preface also says, "The lists of apparatus and materials. customarily placed a t the head of each experiment, are placed instead a t the back of the book far convenient reference by the teacher, the laboratory assistant, or the student. The experiments have been so planned that they may be performed with simple apparatus and inexpensive materials in small amounts." Certain experiments are indicated as best suited for teacher demonstration. Illustrations of set-ups of apparatus are all diagrams and not half-tones. are clear. show essential oarts.omit ~.~ uon-essential Darts.. a n d are easily rrproduccd by the student. All glass tuber and thistle tubes are carrccrly shown with open ends, indicating cooperation between authors and draftsman. Inconsistency in the use of units of measurement m a n the scientific consistency of the text. These terms appear: inches, cubic centimeters, teaspoonsful, meters, and grams. This will doubtless be changed in the next edition. There is a marked ~ ~ c ~the most elarinz one is freedom from ~ v D o E ~ Derrors: "Flourinc" for "l:luorineU in the 'l'ahle of Contents. Thcrc arc apparently only lour quantitative erperimeuts: per rent. of water of crystnllirntion, wight of 22.4 liters of oxygen. equivalent weight of magnesium, and per cent. of oxygen in air. The tables for data and calculations are gwd. The directions themselves might have been more explicit, t o the advantage of teachers who do not like to amplify the tests orally. If the beam balance shown underUnits3andSisto be used,oue might question the value of the k s t three of these experiments. As the magnesium ribbon used in the equivalent weight experiment must be weighed t o the third decimal place, probably a case balance is t o be used, but it is not mentioned, nor is its use described. The unit on Chemical Arithmetic is unusually well done. There are a few minor criticisms. The last line on page 201 might be improved if it read "one gram molecular weight" instead of "one molecular weight"; the per cent. sign a t the end of Example A on page 216 is plainly a typographical error. I s it mathematically and chemically correct t o say that "17 grams = 22.4 liters" (see page 210) when one wishes t o say that 17 grams of ammonia occupy 22.4 liters a t S. T. P.? I t is unfortunate that the authors did not adopt the improved instead style of formula for hydrated salts, e. g., CUSOI.(HSO)~ of the older CuSOv5Hz0, a s recommended by the Committee on Labels of the Division of Chemical Education of the American Chemical Society. I n general, the text is well written, attractively set up, and should be a pleasure to use. WILHELMSEGBRBLOM
I n the Consumable Edition each leaf is punched and perf* rated so that records of the experiments can be removed to a loose-leaf cover, if it is desirable. Diagrams of all of the thirtyone apparatus set-ups needed for the course are included in pages xi to xvii inclusive, whereas in the Nonconsumable Edition each set-up diagram is included under the heading of the exueriment in which i t is t o be used.
. ..
.
.. - .
~
~
.
~.
TBB P ~ L L W EXBTBR S ACLDBMY Exsrxa, NEW H l r ~ s m n ~
LABORATORY AND WORKBOOK UNITS IN CHEMISTRY. Maurice U.Ames, George Washington High School, New York City, and Bernard Jaffe. - . Bushwick Hieh School. New York Citv. Consumable Edition. Silver, Burdett Company, New York 237 pp. 20.3 X 26 cm. $0.84. City, 1937. xvii The text material is practically the same in both the Consumable Edition and the Nonconsumable Edition, so the first review applies to this edition of the book.
-
~
+
I N GENERALCAEMISTRY. TYPICALQUESTIONSAND PROBLEMS G. N. Quam, Associate Professor of Chemistry, Long Island University. Fifth edition. Edwards Brothers, Inc., Ann Ar105 pp. 21.5 X 29 cm. $1.75. bor, Michigan, 1937. v This book is a loose-leaf compilation, in a sturdy binder, of over eight hundred questions, problems, and exercises, many of which contain several parts. They are arranged in thirty-one groups, corresponding to chapter divisions almost universally used in general chemistry textbooks. The appendix contains useful data, and also a table of logarithms. Periodical references suitable for elementary students are frequently given, supplementing a comprehensive list of general references. This book should be of material assistance in obtaininga high level of effort and understanding from students. LOTHROP SMrm TBB STATEU N W B ~ S ~on TY IOWA row* CITY,IOWA
+
NEWWORLDOz CHEMISTRY.Bernard Jaffs, Chairman, Department of Phvsical Sciences. Bushwick Hirh School. New York City. silver, Ilurdett and Co., New ~ o r k city, 1937. xii T 566 PP. Appendix and indcx, xrx pp. 339 figs. 14 X 20 cm. $1.80. An excellent review of the 6rst edition of this high-schwl chemistry text was written by Herbert R. Smith and appeared I n the preface t o in the August. 1935, issue of T m s JOWAL. the 1937 edition, the author states. "The isolation of pure vitamin E, the discovery of artificial radioactivity, the wider use of glass for building and insulating purposes, the production of a new are some of the new developments now type of safety glass. treated in this text. "As the result of the rapid pace of chemical research, some of the fundamental theories of chemistry are still undergoing modification. The discussion of atomic structure in Chapter 11 and all the electronic diagrams throughout the book have, therefore. been modified in accordance with the latest accepted findings." These changes in text involve only a restatement of a sentence or a uaramaoh . - . a t most. The definitions of neutralization and hydrolysis h a w been rcstarcd. Ionic equations throughout the hook have bccn changed from
~~~.~ ~
. ..
t o read
+
H+CINa+OHOHH+ Na+
+
+
-+ - + +
Na+ClHOH ClNaf Cl-
+ HOH
Although the latter equation is in correct usage, the writer has found that it is much mare confusing t o the average high-schaol pupil because of the additional plus signs. I n the first edition several references are madetocurrentarticles OF C HEMCA .I EDUCATION and other periodicals. in the JOURNAL No additional references have been made to articles appearing in issues of the past two years. The writer wishes that the author might make the chapters on organic chemistry a more vital part of the book by placing them earlier in the text. Many teachers follow the text in chapter order, and many times the last chapters are only skimmed over or omitted entirely. If organic chemistry is not made too technical, its lessons and applications can be thoroughly discussed with the pupils and become a usable part of their chemical education. The writer understands from one teacher who is using this
