5o8 Veterinary Medicine. 



ears and horns, and especially the points of the hocks and ischia. 

 The back is sometimes arched and the feet drawn together some- 

 what. 



In the absence of any source of excitement the head may be 

 less elevated, the ears lopped forward or drawn back, and even 

 the eyelids may droop somewhat. These phenomena may last 

 for a few minutes or for an hour or two. 



In testing other genera consideration must be had of the differ- 

 ent normal temperature (horse 99.5", dog 98.5", sheep or pig 

 103°, bird 106°), and the varying susceptibility to tuberculin, 

 the Guinea pig requiring a maximum dose relatively to its size 

 and man or horse a minimum. 



Effect of Tuberculin Test on the Later Average Health of the 

 Animal Reacting. The transient fever and reaction on the day 

 after injection modifies the milk secretion temporarily to a certain 

 extent in ratio with the hyperthermia. The consensus of veter- 

 inarians of the largest experience, and the voice of the Interna- 

 tional Veterinary Congress at Berne in 1895, oppose the doctrine 

 of any continuous effect on the health even of the tuberculous. 

 Yet in the case of Governor Morton's large herd of Guernseys a 

 careful record of temperatures showed that for weeks after the 

 test the reacting animals presented oscillations which were not 

 shown before, and which were not found to occur in the sound 

 animals. In the activities of sanitary work such indications are 

 easily missed. 



Effect of Tuberculin Test on Sound Animals. In 1894 I tested 

 this on a number of thoroughbred Jersey and grade cows, inject- 

 ing them six times at intervals of from five to fourteen days. It 

 led to no appreciable change of the general health as shown by 

 the temperature, breathing, pulse, yield of milk or its quality. 

 Careful analysis was made of the milk at each milking, and in 

 two animals soundness was attested hy post mortem examination. 

 Similar tests made by the Bureau of Animal Industry and others 

 led to the same results. Cows in which the yield of milk was on 

 the gain continued to encrease in the same ratio as those that had 

 not been injected, and those in which it was on the wane showed 

 no more rapid decrease. The butter fats and total solids showed 

 no variation more than appeared in the healthy. 



Action of Tuberculin on Parturient Cows. The testimony of 



