244 
A CONTRIBUTION. 
2. Koch (Prussian Veterinary Reports with Reference to Conta¬ 
gious Diseases, 1870-’71) reports that the vaccination of 
the people of a farm occasioned the infection of the cows of 
the same and eruption of v. vaccina. 
3. In the same Report, for the years 1871-’72, is reported an 
outbreak of v. vaccina among a lot of cows. The first 
eruption was perceived three or four weeks after re-vaccina¬ 
tion of three milkmaids. The disease extended gradually, 
so that in fourteen days of twenty-six cows only three re¬ 
mained immune from the disease. Most of the cows had only 
isolated variolm upon the teats, on others, however, numer¬ 
ous variolse were apparent upon both teats and udder. 
4. In the above Report for years 1874- , 75, Damman reports an 
outbreak of v. vaccina in the Kries Rugen among single 
herds, at the same time that the inoculated variolas were in 
full bloom among the children of the district. 
5. In the Spring of 1876, Schneider communicated to me, that at 
the time the inoculation of the children began, he observed 
genuine bovine variola by four cows in two stables, which be¬ 
came transmitted to two milkmaids, and from one of the 
same in all probability to her children. 
To these communications, which put beyond doubt the origin 
of v. vaccine from the protective variola of man—mensclilichen 
scliutzpocken—I add a communication from Reiter, the trust¬ 
worthiness of which is beyond all doubt. Reiter saw in stables, 
the cows of which he had inoculated with humanized vaccine, 
that the true bovine variola frequently came to eruption by 
several noil-inoculated cows, and was characterized by the same 
course and phenomena as that which came to pass in unknown 
ways—that is, the so-called “ original ” bovine variola. 
The following experiment of Roloff shows that the trans¬ 
mission of the contagium of vaccine to the udder of the cows 
takes place without any difficulty by means of the hand of the 
milker, which is the general vehicle: 
When a plate of glass, upon which was a very insignificant 
quantity of lymph from the inoculated variola of a man in a 
dried condition, was rubbed gently across the slightly eroded 
