240 
GEORGE FLEMING. 
HUMAN AND ANIMAL VAROLE: A STUDY IN COM¬ 
PARATIVE PATHOLOGY. 
By George Fleming, F.R.C.V.S., Army Veterinary Inspector. 
(From The Veterinary Journal, London, England. Reprinted from the Lancet for 
March 20th.) 
(Continued from p. 199.) 
What we might call the casual evidence as to the non-identity 
between human variola and cow-pox, and their being two dis¬ 
tinct diseases of a group, is still further increased bj other facts 
which may be mentioned. The individuality of contagious 
maladies is, perhaps, never more strongly marked than when we 
find the two affecting the same person or animal, and running 
their course concurrently, the various phases of one being passed 
through entirely independently of the evolution of the other- 
Such instances are far from infrequent in the practice of the 
physician and veterinary surgeon, and from my own experience 
I could relate several. But I refrain from doing so, as additional 
testimony of this kind is not required at this period of the nine¬ 
teenth century, I hope. But in the discussion now undergoing 
consideration, such evidence should be borne in mind when we 
mention the fact, that cases are recorded in which people already 
infected with small-pox, and who had been vaccinated when so 
infected, have had the eruptions of the two diseases apparent at 
the same time, each preserving its special characters, undergoing 
its different changes, and terminating exactly as if it were totally 
independent of the other, and had not the slightest influence in 
modifying or checking its course. And more than this, Hall6 is 
reported to have employed the lymph from the vaccine vesicles 
developed under these conditions, to vaccinate healthy children, 
and has only produced the pock of vaccinia—never small-pox. 
In one of Chauveau’s experiments, in which a horse was inocu¬ 
lated with the virus of human small-pox, which gave rise to 
local effects, and was also inoculated with vaccine lymph, evidence 
of the two morbid actions operating coincidently was undeniable, 
