476 EXPERIMENT STATION RECORD. 



The pasteurizing of the milk and stirring the cheese, fine or coarse, did not 

 disturb these ratio figures appreciably. They were also the same whether the 

 cheese was analyzed in the fresh or cured condition and regardless of the 

 method of storing. Attention is called to the fact that these ratio figures are 

 purely experimental and should not be accepted as absolute standards, but can 

 be used as guides for the choosing of such standards. The yield of cheese can 

 be calculated in round numbers when the fat content and casein of the milk are 

 known. 



The Jersey milk gave higher ratio figures than milk from the ordinary Danish 

 cows. These figures, however, were comparatively too low on account of the 

 greater casein content of Jersey milk. For Jersey milk the constant 30 should 

 be used. Jersey milk gave a greater yield of cheese than ordinary milk, due 

 to its higher fat and casein content. The quality of cheese from Jersey milk 

 was no different than that from Red Danish cows. 



A given milk for cheese can, by the addition of skim milk, or whole milk, be 

 so changed in its composition that a previously desired ratio between the fat 

 and casein in the finished cheese can be assured. 



VETERINARY MEDICINE. 



Eesults of research in the general pathology and pathologic anatomy of 

 man and animals, edited by O. Lubaesch and R. von Ostebtag (Ergeb. Allg. 

 Path. Mensch. u. Tiere, 11 {1915), pt. 2, pp. VII +981). —The contents of this 

 volume include the following articles: Pathology of the Circulatory System 

 of Animals, by H. Rievel (pp. 1-89) ; Pathology of the Circulatory Organs 

 of Man, by C. Thorel (pp. 90-718) ; and Relations between the Liver, Bile 

 Ducts and Infectious Diseases, by A. Posselt (pp. 719-937). To each article 

 is appended a large bibliography. 



Infection, immunity, and specific therapy, J. A. Kolmeb (Philadelphia: 

 W. B. Saunders Co., 1915, pp. 899, pis. 31, figs. 100). — This book has special 

 reference to immunologic technique, but also includes some data and methods 

 on chemotherapy. It is divided into five parts: (1) General immunologic 

 technique; (2) principles of infection; (3) principles of immunity and 

 special immunologic technique; (4) applied immunity in the prophylaxis, 

 diagnosis, and treatment of disease — specific therapy; and (5) experimental 

 infection and immunity. Part five may be used as an experimental course 

 for th« study of infection and immunity. 



Abo«.t the detection and significance of leucocyte-attracting substances 

 during infection, M. BiJRGER and H. Dold (Ztschr. Immunitdtsf. u. Expt. Ther., 

 I, Orig., 21 {1914), No. 1-5, pp. 378-409). — For studying leucotactic processes in 

 the animal body, the knee-joint method (on the rabbit) is recommended. 



Comparative investigations of the leucotactic activity of uniform sterile 

 filtered sodium chlorid bacterial extracts, inactive bacterial serum extracts, 

 and active bacterial serum extracts showed that the untreated serum in 

 bacterial extracts was the most active. Leucocyte-attracting properties ap- 

 parently are not only confined to foreign proteins (bacterial proteins) but 

 also to homologous proteins (even body proteins) denatured by coagulation. 

 The proteins after contact with complement-containing body fluids showed 

 an increase of leucotactic properties. This is believed to be due to the forma- 

 tion of leucotactic cleavage products from less active higher complexes brought 

 about by thermolabile serum ferments. The leucotactic effect is said to be 

 proportional to the leucocyte-attracting substances. The multilocular injec- 

 tion of uniform amounts of these substances, provided certain experimental 

 conditions are maintained, does not stimulate the mobilization of leucocytes. 



