The first volume of this work is devoted largely to general subjects such as the history of urology, the anatomy of the parts concerned, general arrangement of a specialist's office, care of instruments, history-taking, filing of records, methods of examination, general symptomatology, urinalysis, etc. One occasionally fails to find mention of some of the methods of examination, as, for instance, some of the color-tests of functional capacity of the kidneys, but as a rule the subjects are very

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... ell covered and the author deserves credit for the thorough and painstaking care which he has given to the minutest details\p=m-\detailswhich are of so much importance to every physician who wishes to succeed. There are so few who are able to develop unaided good systems of their own that this part of the work will be greatly appreciated. In the last few chapters of this volume are discussed the anomalies of the kidney and ureter, movable kidney, kidney stone, tuberculosis of the kidney and operative surgery of the kidney. The second volume is devoted to the diseases of the bladder, the prostate, the urethra and its appendages, the scrotum, the cord, the testicles und the seminal vesicles; it includes a final chapter on lues. Throughout this volume the same attention to details is observed as in the first one. While the views and xvork of others are not slighted, tbe author is constantly relating hoxv and why he does things and that should be the real reason for writing n book; not to tell how someone else does things, but hoxv the author himself does them. He may do many things better than someone else and he may do some things not so xvell, but in any case there is no use writing a book to tell what someone else knows. The characteristic feature of the work is that the author tells his oxvn story and tells it xvell. lie is very frank at times in stating his oxvn ability, as for instance under the treatment of vesical calculus xve find the folloxving: "In men litholapaxy is preferable, ns it is less dangerous to the patient. I do not employ this method, for 1 do not feel that I am in siiUieiontly good practice to Undertake the operation us 1 have so few cases of the kind." Notwithstanding his diffidence, he has illustra fed and described the technie of the operation very clearly. There are 043 illustrations, most of them original. The general practitioner xvho is constantly called on to treat this class of cases, as xvell as the specialist, will lind this a valuable xvork. a part of the animal cell. It is evident that in order to build up the specific compounds characteristic of animal life, "be animal organism must reduce the complex ingredients of t.he nutrition derived from the vegetable to simpler forms. Thus the complex carbohydrates represented by the different forms of starch are reduced to a simple nionosnecharid, "glucose." before they are available for animal nutrition, In a similar xvay the animal organism takes fat of various composition, from various sources and after reducing it to glycerin and the various fatty acids, rccombines it to make the fat peculiar to the individual animal. The same thing holds good for the proteins. They are broken up into their constituent nmiiio-ncids by the process of digestion. The protein of one animal xvill not lit the cell structure of another, since it is evident that the orgunism uses the simple constituents of tile protein molecule, it was of interest to determine if these "building-stones" could be found in the blood. Careful search of the blood and tissues failed to reveal the presence of these ainiuo-acids. This lends the author to propose the hypothesis that the amino-acids are changed dn absorption into the proteins of the blood by the agency of the intestinal epithelium. These new-formed proteins circulate in the blood ¡is the common nutriment Of the body cells. Each cell again digests the albumin molecule into the const it neuf amino-acids and from them reconstructs the specilic protein which it. needs for its oxvn structure or to perform its special functions. The relations of these processes are developed in various directions. The possibility of nourishing an animal completely on a simple mixture of glucose, fatty acids, glycerin. amino-acids and the products of digestion of liucleoproteius has been shown by experiment. Tbe possibility of using such a mixture solves the problem of producing foodstuffs artificially, although the laboratory cannot yet compete economically xvith the vegetable world, and, as our author remarks, there xvould always remain the chance that by inadvertence one or other important building-stone might be forgotten ill milking the mixture. In this monograph xve bave a very interesting and suggestive presentation of one of the important problems of Science. It should be Widely read and no doubt, its inlluence in stimulating further research on this and allied subjects xvill be one of its greatest benefits. Nerv\l=o"\se Angstzust\l=a"\nde und ihre Behandlung. Von Dr.