BUREAU OF ANIMAL INDUSTEY. 367 



tory that a definite diagnosis might be made. Of this number it 

 was found that 03 dogs, 12 cats, o cattle, and 2 horses were rabid, 

 as their brain tissues revealed the presence of Negri bodies when 

 examined by means of the microscope. The origin of these rabid 

 animals was as follows: District of Columbia, 56; Virginia, 23; Ken- 

 tucky, IG; Maryland, 7; Tennessee, 7; and South Carolina, West 

 Virginia, and Illinois, 1 each. 



It will be noted from the foregoing that an unusually large pro- 

 portion of rabid cats were received, 12 of these animals having 

 reached the laboratory, together with 8 that were suspected of being 

 affected. 



BLACKLEG. 



The preparation and the free distribution of blackleg vaccine have 

 been continued during the past year, during which time 1,340,380 

 doses have been prepared in the laboratory and distributed among 

 cattle raisers. "With greater and improved facilities for the manu- 

 facture of vaccine we have been able to send out without delay a 

 much larger supply of vaccine of uniform quality than heretofore. 



The statistics of vaccinatif)ns for the fiscal year, as reported to the 

 bureau by stock raisers who have used the vaccine, indicate that the 

 same efRcient results have been obtained as those reported for pre- 

 vious years, when the death rate showed a reduction to less than one- 

 half of 1 per cent. 



CHRONIC MASTITIS. 



Recognizing the importance of tubercular and streptococcic mas- 

 titis, an investigation of 1.021 udders of cows was made for the pur- 

 pose of ascertaining the proportion of diseased udders among them. 

 These were divided into two lots. The first lot consisted of 521 non- 

 tuberculous cows, and the last of 500 cows which had been " retained " 

 on the killing floor in the meat inspection for either very slight or 

 extensive tubercular lesions. 



Of the first lot, 38 of the udders were foiuid diseased. All of 

 these, with the exception of 1, contained pus, which was either con- 

 fined to the large milk ducts or diffusely scattered through the organ. 

 The one in which no pus was found contained a small growth in one 

 hind quarter, which proved to be a carcinoma. The organisms which 

 were found to be responsible for the lesions in the remaining 37 

 udders were as follows: Streptococci were found in 18, streptococci 

 and staphylococci in 7, diplococci in 2, streptococci and Bacillus 

 pyocyaneus in 7, and actinomyces in 3. A careful examination for 

 tubercle bacilli was made in all, but none were found. 



Of the 500 carcasses retained on the killing floor for tuberculosis, 

 35, or 7 per cent, of the udders were found to be diseased. Tubercle 

 bacilli were found in 5.7 per cent of them, and actinomyces were 

 found in 1. The remainder of the udders contained various pus- 

 producing microorganisms in about the same proportions as the 

 udders of the 521 nontuberculous carcasses. 



CASEOUS LESIONS IN SUBMAXILLARY LYMPH NODES OF SWINE. 



These lesions appear as very small caseous areas varying in size 

 from one-eighth to one-fourth of an inch in diameter, and are white 

 or greenish white in color, surrounded by a delicate fibrous capsule. 



