the text are clear and should go a long way t o eliminate many difficulties which the subject presents. The printing and the diagrams are excellent; but the paper is so weighted that the hook is uncomfortably heavy t o handle. The binding is so flimsy that it had already begun to break down when received by the reviewer. H. W. FOOTE
and Chemistry, Crystals and Arrangement of Atoms in Space, Different Varieties of the Same Substance, How Light Affects Matter, X-Rays, Elements that Emit Rays, What is an Atom?. Chemical Attraction, Breaking up the Atom, Electron Diffraction, Living Things, The Vitamins, How Plants Grow, The Colors of Leaves and Flowers, and Inheritance. I n the first few chauters of the hook somethine " of a chronaloeiYALBUNIVBPSITY cal order of presentation is used, which makes the material easy NBW HAY&N. C O N N B C ~ C O T t o follow. However. this order is not maintained throughout the hook, and each chapter is something of a unit in itself. This DIE CHEYIEDES PYRROLS.I1 Band. Pyrrolfarhstoffe. 1 Hafte, arrangement is a fortunate thing and makes the hook a far mare Porphyrine. HZmin, Bilirubin und ihre Ahkammlinge. Hans useful one for reference and supplementary reading than it Fischer and Hans Orlh. University of Munchen, Germany. might be, H ~ one might ~ ~ wish~ to revem the ~ Akademische VerlagsgeseUschaft m. b. H.. LeipZig, 1937. 764 order of some of thechapters in the book. I n particular might be pp. Paper covered, RM. 42, bound, RM. 44. mentioned the one on "How Lieht Affects Matter." which deals During the past years considerable progress has been made in with the emission of light by atoms and the spectra of elements the elucidation of the chemical structure of animal and plant and gives a somewhat detailed discussion of the spectrum of pigments and in the preparation of certain of their degradation hydrogen in which is included the mathematical formulas for products and in the synthesis of various natural compounds. the Lyman, Balmer, Paschen, and Brackett series of lines which The senior author (Fischer), who, in collaboration with his various precedes by three chapters the one on "What is an Atom?" associates, has contributed a great deal to the solution of this which gives the modern interpretation of the energy levels of the intricate problem, has, in coaperation with Orth, undertaken t o atom and the distribution of electrons in these levels, etc. Or, write a comprehensive review of the latest achievements in this one mieht feel that the "Lavman" could follow the relativelv field of biochemistry. Their hook, which is written in several simple chapter on con.hustion earlier in the discussion rhan he volumes, is more or less an encyclopedia on this subject. In could understand thc onc on electron diffraction whtch prcc~des this volume the authors have discussed in detail the chemistry the former by several chapters. But one must remember that of parphyrin, haemin, bilirubin and their derivatives and have it is impossible to choose a wholly satisfactory order of presenting described the preparation and properties of several hundred re- material and that things are very much as the proverbial Irishlated derivatives of this group of compounds. Throughout this man said, "Any subject would he easier t o learn if one could know volume the authors have not failed to point out the chemical something about it before starting to study it." At any point in often a eaod interrelationships between the different groups of compounds. the discussion of a subiect some knawledeeand " The description of the chemical investigation has been wisely deal of knowledge--must he presupposed. And although this illustrated as much as possible by structural formulas which will book is written in about as elementary a fashion as possible it make it easier for ~most t o understand the reactions iu- presupposes, in many places, a fair amount of knowledge of -~~ --.-.--~ ~ -readers volved. There can he no doubt about the thoroughness with chemistry and physics, or a t least these are necessary for a thorwhich the authors have compiled the great number of references ough enjoyment and understanding of the material. I n writing this hook the authors have undertaken and done well the most which deal with this suhject. The hook will he welcomed by those who are actually engaged difficult thine to do. T o write with scientific accumcv over a wide range of marcrial for the layman is nor an easy task. in this field of research, as it gives them a convenient source of Any really adverse rrnh.ism which the revicwer mighr wish ro finding any desired information and reference concerning this suhject of biochemistry. The book is too advanced and too de- menuon would be rhe kind that mighr he pnsxd upon this sort tailed to be af great use and help to the student of chemistry of hook in general. I t is not a text and cannot be studied as such, but i t is almost too brimful of well-ehosen information-and and t o the teacher of general college courses in chemistry. some on highly technical s u b j e c t s f o r a book which, in places, HANSJENSEN reads nearly as easily as fiction. For the most part, the hook U ~ ~ v m s OF n rC ~ ~ r s o n n r * BBRKBCBY, CALIBOPNIA reads easily enough for reading a t a few sittings. One is tempted t o run on without being conscious of the vast amount of material CHEMISTRY, MATTER,AND LIFE. Stephen Miall, LL.D., BSc., and that he does not take time to digest. One who does not already Levrence Mackenzie Miall, B.A. Longmans, Green and Com- know the subject well might find himself rather breathless withpany, New York; Edward Arnold and Company, London; out knowing exactly why. The hook has the good and the had qualities of one of the better books which treat so widely of the published in London by Richard Clay and Sons, 1937. x science of chemistry for the layman. 296 pp. 12 X 18.5 cm. $2.60. Perhaps the thing regarding this hook that will he of most inMuch regarding the nature and purpose of this book can be terest to the teacher is the fact that a chapter or two a t a time inferred from the title, "Chemistry, Matter, and Life." The can be used as supplementary reading. Students will find the authors state in their opening sentence, "We are trying in this hook helpful and stimulating additional reading. The paper and b w k t o explain in the simplest possible language the nature of the size of the print are not all that could he desired for such a material things, the changes they undergo as the result of chemi- book, hut i t is well illustrated with excellent photographic plates cal action or the iduence of light, the nature of the substances and diagrammatic drawings. Without very obviously trying t o that exist in living plants and animals, and how these alter in the do so, the authors have succeeded well in leaving the reader with ordinary course of their lives." The above statement together a very definite feeling of the universality of chemical phenomena with some of the chapter headings which fallow indicate that the and of the intricacies and beauty of the laws governing the bebook is a treatise for the "intelligent layman," which runs the havior of matter. The book is worthy of a useful place in the gamut of inanimate matter and gives some introduction to the school or college library as well as in the private library. behavior of animate matter. Some of the twenty-seven chapter H. H. FILLINGER titles which may he mentioned are as follows: Early Pioneers, Homlws COLI_BOB HOLLINSCOLLBOB. VIROINI~ The Chemists' Signs and Symbols, Family Groups, Electricity
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