204 CONTAGIOUS DISEASES. 



however, that the removal of the infected articles was not 

 always accomplished so punctually as had been enjoined, so that, 

 on one occasion at least, the cows were seen in the midst of them, 

 and licking up the flock of the bed which lay on the grass. 

 These cows were in perfect health when first put out to graze in 

 this meadow ; but in twelve or fourteen days five (out of the 

 eight) milch cows appeared to have heat and tenderness of the 

 teats. The teats became swollen, and small, hard pimples could 

 be distinctly felt upon them as if imbedded in the skin. These 

 pimples daily increased in magnitude and tenderness, and in a 

 week or ten days rose into blisters — vesicles — passing into 

 brown or bhackish scabs. "When the teats were in this condition 

 and very tender, constitutional symptoms of ill health became 

 developed. Sudden loss of milk, drivelling of saliva from the 

 mouth, frequent inflation and retraction of the cheeks, staring of 

 tlie coat, tucking up of the flanks, sticking up of the back," and 

 rapid loss of flesh, were the appearances observed. By the 

 middle of tlie third week the pustules were mature, " and the 

 trusts and loose cuticle began to be detached." One interesting 

 fact was brought out in the course of this outbreak, namely, that 

 heifers may be affected with variola as well as milking cows, 

 an occurrence which up to this period was supposed to be 

 impossible. The reason for this is obvious, heifers before 

 calving, bulls, and oxen not being subjected to the same chances 

 of accidental inoculation as milking cows. 



The interesting papers on this subject by Mr. Ceely, pub- 

 lished in the eighth and tenth volumes of the Transactions of 

 the Provincial INIedical and Surgical Association, and the Eeports 

 of the Vaccination Section of the British Medical Association, 

 contain many important facts bearing upon the identity of 

 variola vaccinse and human small-pox, and are well worth the 

 careful study of every veterinary surgeon. But whilst these 

 experiments seem so clearly to prove the identity of the variola 

 of man with that of the cow, those of Chauveau point to an 

 opposite conclusion. He performed numerous inoculations with 

 small-pox lymph on the cow, which induced papular pustules, 

 having no analogy with those of cow-pox. The lymph from 

 those pustules implanted on man produced small-pox and not 

 cow-pox; and it is stated in the Boston Medical Journal for 

 1860 that during that year Martin inoculated some vaiiolous 



