666 Bulletin 82. 



there is shown a gain of 141 lbs. and 115 respectively. It is 

 worthy of notice that the last weighing, which makes the highest 

 record was made three to four hours after the morning feeding, 

 and (in the case of the three first cows) of the morning milking. 

 The two dry cows had been watered but had not been fed on the 

 morning of the last weighing as they were just about to be killed. 

 It may be concluded that the repeated test doses of tuberculin 

 had in no injurious way affected assimilation and that, in the 

 two Holstein cows, it had not prevented a perceptible improve- 

 ment in this respect. 



POST MORTEM EXAMINATIONS. 



To complete the record the two farrow cows were killed 

 Dec. 5th, 1894, ^iid subjected to careful necropsy. In the main 

 the viscera were sound. The shorthorn grade had pus in each 

 of the left quarters of the mammary gland in the milk sinus, the 

 walls of which were red and thickened. When stained and 

 placed under the microscope, the pus showed numerous cocci but 

 no bacilli. 



As is usual in old cows, the groups of lymphatic glands in the 

 intermaxillary and pharyngeal regions, in the chest, the abdo- 

 men, the subcutaneous and intermuscular regions were pig- 

 mented of a dark grayish color, varying at different points but in 

 no case showing molecular degeneration, coagulation-necrosis 

 (cas.seation ) nor even perceptible congestion. In the shorthorn 

 grade the lymphatic glands behind the diseased mammae were 

 considerably enlarged . 



EXPERIMENTS AT THE U. S. BUREAU OF ANIMAL 



INDUSTRY. 



In the "investigations concerning bovine tuberculosis 1894," 

 Dr. Schweinitz records the effect on the milk of two healthy cows 

 one of which received one dose and the other three successive 

 doses of tuberculin. The dose on each occasion was 2 cc. for 

 each cow and as they were common stock it may be inferred that 

 it was a full dose considering the probable weight of the animals. 

 Of variations in temperature it is enough to say that there was no 

 more than would occur in the best of health. The analysis of 



