VETERINARY SCIENCE AND PRACTICE. 1087 



During- the first 2 years it was impossible to diagnose tuberculosis 

 in the cows by ph^'sical syniptonis, except doubtfully in one case. 

 During the following year and a half, however, physical examination 

 gave good evidence of the disease in 3 out of the 4 cows. The fact that 

 no case of tuberculosis appeared in the calves until the}'' had been fed 

 upon the milk of these cows for from 1 to l^year.s, and had ))een almost 

 constantly associated with them, indicates that there is little danger 

 from the transmission of tul)erculosis during its earlier stages. 



Serum diagnosis of tuberculosis in cattle, S. Arloing {Jour. Med. 

 Vet. et Zootech.., o. ser., Ji,{lDOO)^ pP- W-¥^S). — The author conducted 

 3 series of experiments for the purpose of determining the action of 

 blood serum in agglutinating quantities of tubercle bacillus. In the 

 first series the serum was prepared from the blood of calves, in the 

 second from the l^lood of healthy cattle, and in the third from the 

 blood of adult tu))erculous cattle. In the first series of experiments 

 the blood of 30 calves was tested with reference to its agglutinating 

 power; the calves were from 5 to 8 weeks old. From none of the 

 calves was a serum obtained which would agglutinate quantities of 

 tubercle bacillus, even in the proportion of 1 drop of the serum to 2 

 drops of the culture. In the second series of experiments 50 adult 

 cattle were utilized, from which serum was prepared and mixed with 

 homogeneous cultures of the tubercle bacillus, in the proportions of 1 

 to 5 and 1 to 10. In no case did the serum produce agglutination in 

 the proportion of 1 to 10, while in the proportion of 1 to 5 the serum 

 from 21: out of 50 subjects had a more or less pronounced agglutinating 

 effect. In the third series of experiments the author studied the serum 

 of To tuberculous cattle. Of this number of experimental animals 69 

 furnished a blood serum with agglutinating power when mixed with 

 quantities of the tubercle ])acillus in the proportions of 1 to 10 and 1 

 to 20. In the remaining cases the agglutinating power was not pro- 

 nounced in mixtures of 1 to 5. The author attempted to determine 

 whether there was a definite relation between the intensity of the 

 agglutinating power and the extent of the tu])ercular infection. Such 

 relation was not apparent. From these experiments it is concluded 

 that, as a general rule, the blood serum of a tuberculous animal has 

 the power of agglutinating the tubercle bacillus in homogeneous cul- 

 tures in the proportion of 1 to 10. An animal of which the blood has 

 such power may therefore be considered tuberculous. This test may 

 be used in checking the results from tuberculin tests and ma}- also be 

 appl i ed i n depe n d e ntly . 



The hereditary transmission of tuberculosis through the pla- 

 centa, G. lyAiiiiKH) {Cevtbl. Bal't. u. Par., 1. Abt.,:3,S' {1900), No. W, 

 pp. 0SS-69T). — In order to secure evidence of the hereditary transmis- 

 sion of tuberculosis, the author conducted two series of experiments, 

 in one of which guinea pig's were allowed to "become pregnant after 



