498 
J. W. GADSDEN. 
May 2d the scab came off. The rash which began on the chest 
spread to the arms. On May 3d the rash was less bright, and on 
the right shoulder there was evidence of a slight exfoliation of the 
skin. In three or four days after this the child was restored to 
perfect^health.” The second child was inoculated in the presence 
of Dr. Stubbert, who kindly permitted me to test the virus not 
only in this, but in the previous instance. The only result I ob¬ 
tained in this second case was a slight erythematous blush, which, 
after existing two or three days, gradually disappeared. There 
was no systematic disturbance. With scarlatinal virus modified 
by transmission to the cow, I inoculated two other children, pro¬ 
ducing in them a distinct local lesion. These children have not 
since developed scarlet fever, although the disease has existed in 
their immediate neighborhood, and they have been more or less 
exposed to its influence. While the subject-matter of this paper 
thus presented to you does not furnish a positive answer to the 
question, “ Can we prevent the development of scarlet fever by 
the use of virus obtained in one of two ways, as indicated above,” 
it does offer some truthful statements which suggest an answer, 
and which, I trust, will incite the professsion to aid me in the fur¬ 
ther prosecution of this very interesting and important line of in¬ 
vestigation. 
CONTAGIOUS PLEURO-PNEUMONIA, 
HOW THE CONTAGION OF PLEURO-PNEUMONIA IS COMMUNI¬ 
CATED, WHY THE DISEASE HAS NOT BEEN EXTERMINATED, 
AND THE ONLY METHOD BY WHICH IT CAN BE ERADICATED. 
By J. W. Gadsden, M.R.C.Y.S. 
It seems hardly necessary to say that pleuro-pneumonia, or 
lung plague in cattle, is incurable and highly contagious; but the 
result of careful research, and the experience of years, shows 
that the contagion can only be communicated by contact with the 
living diseased animal. 
The disease is so insidious that it has only been after the most 
•/ 
careful and thorough tests that this decision could be arrived at. 
