296 
ON THE TRANSMISSION OF DISEASES 
The owner told us that the little animal had had this disease 
about a month and a half, and that the same had begun to appear 
on the mother fifteen days before. We examined some of these 
scabs about her teats and under her belly, and they appeared 
to be of the same nature with those on the calf. They evidently 
proceeded from him, and in the act of sucking had communi¬ 
cated to his mother the disease by which he was himself 
affected. 
That, however, which most surprised us was the assurance of 
M. Fourcade that one of his brothers, who had been in the habit 
of feeding and milking the cow, and also one of his children, 
that had been accustomed to play with the calf, had caught the 
dartres both on their wrists and their arms. The eruption had 
been observed about four or five days, and, in his opinion, had 
been given to them by the cow and her calf. His little boy, who 
had accompanied him, shewed us his arm, on which we saw 
several red prominent spots whence a reddish serosity exuded, 
forming patches as large as a five-franc piece. 
Case IV.—On the 20th of the same month, M. Cirre, of 
Minimas, brought to us another cow, followed by her calf two 
months old, that had had this scabby eruption on its forehead 
and withers about a month. The cow also had eruptions on her 
teats, her dewlap, and her lips; but they had not appeared more 
than five or six davs. We concluded that the disease had, as in 
the former instance, been communicated from the calf to its 
mother. 
Some time afterwards, this opinion was confirmed by the ap¬ 
pearance of an eruption of the same nature on the thigh of the 
farmer, and on the wrist of his wife. 
Case V.*—On the 20th of January, 1838,1 went to the dairy 
of M. Barrot, of Terre Cabale, to examine several cows that had 
the dartres. The cow-house was small, low, ill-ventilated, and 
unwholesome. It was divided by a wooden partition into two 
compartments; the one, and the smaller of the two, being des¬ 
tined for the calves, and the other containing the cows. It ad¬ 
mitted neither air nor light, except through the door, and that 
was generally closed. 
I saw there three calves from two to three months old, and all 
of them having the dartres —one about the neck and ears, another 
on the forehead and the back, and the third on the forehead and 
the thighs. Instead of the large scabs which I had seen in the 
former cases, they were covered with small scales and slight 
epidermoid exfoliations, possessing all the characters of furfura- 
ceous dartres. 
On my inquiring into the probable causes ol'this disease, I was 
