696
N E W BOOKb.
Dr. Delbruck intimates that the most important development is that ’‘our investigations have gisen a new interpretation to the views developed by Buchner, that in the life of yeast \ye must differentiate protoplasui-the seat of life-and erzqmc-the uwrkiiig constituent (hrbeitstoffe)-of the organism. Their prosecution has now developed iacts which n-ill be of importance to the fermentation industries and particularly to physiology. Tlie theme is the struggle of the enzyme in the ).east cell.“ T h e book has a value therefore beyond the boundaries o i the industries named and while it should be found in the ivorking libraries of all progressive technologists it will be found useful as a source o f valuable suggestion to biologists aiid physiologists in their work. I\-.~ I C M U R T R I ~ . A LABORATORY MASUAI, O F PHSbICS F O R YSE Ipi HIGH SCHO0I.S. BY HENRY CREW’,PH.D. A X D ROBERTA. TAT~XALL. Kew York: The Macmillan Company. 1902. xii - 234 pp. Price, 90 cents. t i P f
T h e authors have certainly succeeded in producing a very commendable book. T h e esperiments have been carefully selected with a view “to illustrate the first principles of physics as simply as possible,” and the directions for their performance are so clear and to the point that much teaching energy is saved. Several new experiments a r e given as substitutes for the classical ones o r to illustrate points hitherto somewhat neglected in elementary physics. Tlie number of esperiments is sufficient to admit of some latitude of choice, and by means of references the \vorli in the laboratory is brought into close correlation with seven of the best test-books on elementary physics. There are three appendises, the first being an interesting reprint from a paper by Robert Eoyle on ‘‘-A New Essay Instrument, etc.”, published in 1675. the second giving advice as to the selection of a galvanometer. and the third containing various physical constants. C. E. L I S C B . ~ R G ~ R . PLATTNER’S niasu.qL OF Q U ~ L I T A T I V E AXD QUASTITATIYE ASALTSIS KITH THE BLOWPIPE. Translated b j HENRYB. CORSWALL.E.M.,
P h . D . , assisted by JOHN H. CASWELL,-4.M. Eighth editioii revised after the sixth German edition, by PROF.FRIEDRICH KOLBECI;. Illustrated with S7 wood cuts. S e w Tork : D. \‘an Sostrand Company. 8vo. Cloth. Price, $4.00.
-411 students of blowpipe analysis will be pleased to have this latest edition of Flattner‘s classic ivork in their libraries. especially
