VETERINARY MEDICINE. 483 



Hog- cholera and methods of control, E. A. Oahill (Amer. Vet. Rev., 46 

 (1915), No. 4, pp. 417-424). — ^A discussion of the methods of preventing and 

 treating cholera in hogs by serum and serum virus, and of the causes for 

 failure. 



The refractive index of serum from pigs immunized against hog cholera, 

 E. Peoniewicz (Abs. in Berlin. Tierdrztl. Wchnschr., 30 {1914), No. 29, pp. 520, 

 521). — The refractive index of the sera of either normal pigs or of pigs hyper- 

 immunized against hog cholera showed no characteristics which would enable 

 one to detect the presence of hog cholera virus or antibodies. 



Shall we adopt the use of hog cholera serum and virus as an immunizing 

 and curative agent? S. J. Marquardt (Amer. Vet. Rev., 46 {1915), No. 5, pp. 

 542, 543). — ^A plea for the discontinuance of virus in immunizing against hog 

 cholera. 



My experience with the simultaneous method of immunization, H. A. 

 Smothers (Amer. Vet. Rev., 46 {1915), No. 6, pp. 621-625). — ^An account of some 

 untoward results obtained by the serum simultaneous method. 



The filterability of Bacillus bronchisepticus, with an argument for a uni- 

 form method of filtration, N. S. Ferry {Jour. Path, and Bact., 19 {1915), No. 4, 

 pp. 488-49S; abs. in Science, n. ser., 41 {1915), No. 1060, pp. 619, 620).— The 

 author here reports a series of filtration experiments with B. bronchisepticus, 

 which has been described as the cause of canine distemper. The work was 

 carried on with a Berkefeld N and six Pasteur F candles that upon test showed 

 no signs of leakage or weakness at any point and gave a very high efficiency as 

 recorded by the pressure gauge. 



" The results of the work proved conclusively, according to all rules as laid 

 down by the several authorities on filterable viruses, that the B. bronchisepticus 

 is a filterable organism. The work also corroborated the results of previous 

 investigators with regard to the fact that the less pressure used the more 

 easily will some organisms pass through the filters." 



Is Leucocytozoon anatis the cause of a new disease in ducks? A. B. Wick- 

 ware {Parasitology, 8 {1915), No. 1, pp. 17-21, pis. 3). — Numerous inquiries re- 

 garding an apparently infectious disease which appeared among ducks at 

 Ottawa, Ontario, led to the investigations here reported. At a poultry farm 

 on which the investigations were conducted young ducks were found dying at 

 an average of 20 a day. The mortality was exceptionally high, being estimated 

 at 65 to 70 per cent, and the young ducks that recovered remained undersized 

 and stunted. 



Examinations of the blood showed the presence of L. anatis in large numbers 

 in the peripheral circulation of the ducks in which the affection ran an acute 

 and fatal course. These protozoa gradually diminished in number in the 

 ducks which made an apparent recovery, while in contact birds which pre- 

 sented no clinical manifestations parasites were not demonstrable. Attempts 

 to transmit the disease failed. 



The author found that until further experimental studies are undertaken 

 no general conclusions should be drawn. The fact that this parasite was 

 present in large numbers in all affected birds and absent in all the controls 

 coming under observation is considered significant. 



Poultry parasites: Some of the external parasites that infest domestic 

 fowls, with suggestions for their control, G. W. Herrick {New York Cornell 

 Sta. Circ. 29 {1915), pp. 29-39, figs. 5). — ^This is a popular account of the com- 

 moner parasites of poultry and control measures, descriptions of which are 

 given in the bulletin previously noted (E. S. R., p. 353). 



