THE ANALYST. 111 REVlE WS. DIE GAHRUNGSORGANISMEN IN DER THEORIE UND PRAXIS DER ALCOHOLGAHRUNGSGE- The above work, which is dedicated to Dr. Hansen, of Copenhagen, will be welcomed by chemists and all others concerned with the alcoholic fermentation indus- tries. It is divided into three chapters, the first of which gives a short but succinct account of the principal theories of fermentation which have been propounded since the introduction of the microscope. The second chapter, which contains a descrip- tion of the apparatus used and the methods employed in a fermentationphysiological laboratory, is a very important one from a practical point of view. The author, having acted as assistant at Carlsberg for a number of years, is able to give collectively the methods employed there-the fountain-head, as it were, of this kind of work; though those employed elsewhere are not neglected.Chapter 111. contains a description of the chief micro-organisms met with in the alcoholic fermentation industries. Intermingled with the above subjects, which are indicated in mere out- line, much information of an interesting and valuable nature is to be found, such as the variations, temporary or permanent, that can be artificially brought about in the Saccharomycetes, etc. The directions all through the book are given with such clearness and minuteness of detail as to render the work eminently adapted for self- instruction. I t is copiously illustrated, the engravings of the micro-organisms being particularly fine, Not the least valuable feature of the book is the large and full synopsis of the literature of the subject given in the appendix, a noteworthy innova- tion being the addition of short abstracts to many of the references, which give the essential points contained in the treatises or papers mentioned.WERBE. By ALBERT KLOCKER. Stuttgart : Max Waag. Price 9 marks. W. J. S.112 THE ANALYST, A TEXT-BOOK OF URINE ANALYSIS, FOR STUDENTS AND PRACTITIONERS OF MEDICINE. The chief fault we should feel inclined to find with this book is that, while scarcely sufficiently comprehensive for the specialist, it is unnecessarily full for the practitioner. In most cases the various tests are clearly and concisely described, and the precautions necessary to avoid error are well explained. Unfortunately, however, one of the most important tests, from the point of view of the practitioner-viz., the coagulation of albumin by heat-is by no means well described.Filtration before boiling is not mentioned, nor the well-known expedients for contrasting the boiled with the unboiled part of the urine, and the best way of viewing the urine is also left to the, perhaps inexperienced, experimenter. Attention to these points greatly increases the defilicacy of the test. The various tests for sugar are, on the whole, well described. We are, however, of opinion that Trommer’s test might well have been omitted; for, unless applied with the greatest care, it is more apt to conceal than to reveal the presence of sugar. If it is to be used at all, the urine should, after the addition of the sulphate of copper, be filtered before hoiling. The directions for the estimation of urea by hypobromite also leave something to be desired. All the apparatus described, with the exception of Huefner’s original one, are only makeshifts, and in using them much time has to be wasted to allow the apparatus to fall to the temperature of the room. Also, why waste nearly a whole page in describing the Doremus apparatus, i n which the author himself does not seem to believe? The book is well printed, on good paper, and is commendably free from printer’s errors. A. D. By JOHN H. LONG, M.S., Sc.D. Price $1.5 dollars.