We shall first invite attention to the medical papers in this volume. These are rather more numerous than the surgical, and some of them are scarcely of as practical a character as is desirable in a volume of Hospital Reports. We are glad to see, however, that the editors are determined that the series, of which this volume is a part, shall not only be continuous but valuable, for even those papers to which we have alluded as not of a practical character show great care in their preparation. Dr. Peacock's communication is of course valuable, and to Dr. Evans belongs the merit of having contributed a paper which not only gives us a good deal of information, but will do much towards causing the recognition of the fact that thoracentesis is not merely a justifiable operation, but one which in many cases a due sense of his obligation to his patient will compel a conscientious physician to perform. Art. I. An account of some Experiments relating to the Influence Exercised by Colloids upon the Forms of Inorganic Matter. By William M. Obd, M.B., London.-Mr. Ord contributed a paper to the first volume of these Reports, entitled "Some experiments relating to the forms assumed by nric acid," which was noticed in the April number of this Journal for 1871, and in which he showed very clearly that the crystalline forms assumed by uric acid in the urine have a definite relation to the composition of that fluid. In the present communication he demonstrates equally clearly that colloids have a decided influence in controlling crystallizing force, and that albumen is much more active, in this respect, than gelatine. The paper will be found of interest to those who arc especially engaged in this kind of investigation, but does not very readily admit of analysis. Art. II. On the Period of Incubation of Typhus, Relapsing Fever, and Enteric Fever.
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