long paiostaklng way by n group of highly-trained scientific men, business men and engineers.. .. NOonegenius will d i i i i i i t i i i i i g h t : (&yes, P. 36.) The following paragraph illustrates the fine spirit of patriotism running through the hook"The young chemist must prepare himself to receive the torch of leadership.. ..and by hi* science, art and skill. complete the process of making America as free from the ehemied dominance of other nations as our forefathers made it independent of political and morel dominance." (Deemer, p. 117.) The book has a tremendous appeal to the imagination. The present power of chemistry and its inevitably brilliant future are impressed on one a t every turn. One field of research is likened t o a "new and unexplored continent. of which wesesrcely h o w theshoreline:' (Speer, P. 73.) Law (p. 84) says "the ugly little eotton seed will be found comparable only t o Alladin's lamp io the products which i t will produce and the food for scientific research which it contains." According t o Gillett (p. 198). "in all the advances of metallurgy, the chemist has done, is doing and will do most of the work. New inventions.. .. w e n the namcl of which we do not know, will come. Chemists who will.. ..acquire thie new knowledge are now g r o e n g up, t h o w h they may not know they are going t o be chemists.. .TO any such chemists t o be.. ..the writer offers his congratulations, first. because their work will be a service to mankind and second, because they will have a mighty interesting job." The many ~ ~ c e e r n fapplieatioos ul of ehemistry, the achievements of famous chemists and the promise of future sveeesses cannot fail t o stimulate the interest and fire t h r imagination of the moet casual reader. R. A. B ~ m n
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General Chemistry.
H o a ~ G. c ~D a m ~ o . John Wiley & Sons. Inc., New Yark. 1923. xii 605 pp. $3.50.
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The author ha. made a special effort to give his book Eexibility. "The purpme has been t o encourage the instructor t o teach what he wishes to teach, in the order that seems hest to suit the past preparation and future neednof his students." The book may be u3cd equally well by beginners and by students with previous koowlcdge of chemistry, ss the arrangement of the material permits the employment of a somewhat different sequence of topics in the two rases. A feature of the book is the provi~io"m a d e i n the form of additional paragraphs and difficult exercisesfor the student of superior ability. The book ie thoroughly up-to-date. The present viewpoint of tbe constitution of matter is introduced early and used throughout. There are chapters on the colloidal state, on nutrition,
and on electmehemistry, in addition t o those on the more important carbon compounds. The author and the publishers have spared no pains io their effort t o make the text of maximum value t o the student. There are graphic summaries and exercises a t the end of each chapter. and general review exercises st the end of the book. The sppendix is very complete and ineludes a bibliography and a list of important events in the history of chemistry. The lined r a w i n s and photographs are carefully selected and well executed. There are frequent hints and devices t o warn the student of difficulties and to assist him in his study. There are few mechanical and typographical errors. The hook seems to be endowed with much of the freshness, enthusiasm and vision of its author. It may seem strange and different at the first reading to thore who have already examined dozens of introductory texts, but interest deepens as the reader understands and enter* into the spirit and purpose of the author. Certainly no teacher of college chemistry should fail to give this text his careful consideration. H. H. LLOYD Erercises in General Chemistry. HORACEG. DEMNGassisted by S n a B. Aagnron. John Wiley & Sons, Ine.. New York. 1924. This laboratory manna1 has been advanced "with the thought.. . .that an elementary eour~e in chemistry has.. ..three chief aims: 1. To make the student familiar with a few representative types of matter. 2. To reveal some of the genera1 principles that govern the transformatione of matter. 3. To afford mmc experience with the experimental methods by which chemistry has won its advsneeo." The exereisea are presented in an attractive form. There in first a general statement to make plain the purpose of the experiment. Then come the directions, including a list of materials needed. They frequently take the farm of experimental ~roblems. The su&ition. t o be answered bri the ;fudent are grouped a t the end. Each question refer- by number to n dmgnafcd part of the dircrlion,. Space r r provided for writing the a n rwcr, ,he manual. if it 1s derircd I n accordance with the plan of the authors, the exercises io the firat part of the hook include descriptive and preparative work, and a number of quantitative experiments. A variety of laboratory procedures involves the use of a "aricty of apparatus. The last third of the work is given over t o systematic qualitative analysis. This takes the place of purely descriptive, testtube experimentson the metals. In the opinion of the reviewer the authors have done nn excellent piece of work in the preparation of their "Exercioer." H. H. LLOYD
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