62 Scientific Memoirs by
list may be added inoculation of the dog (1) with reproduction of the hæmato
-zoon, by Mr. Gunn, A.V.D., (Quar. Jour. of Veter. Science in India, No. 19,
page 240, April 1887). In most of these instances details of experiment are
given sufficient to show that adequate precautions against error were duly
practised: seemingly the results were never of a doubtful character; and, lastly,
it would appear that the inoculation experiments were invariably successful, so
far as concerns repetition of the blood-organisms. As regards identity of the
morbid state induced with that naturally acquired, not less ample proof is afford
-ed in the instance of the horse and mule,—see Appendices D, E, F, and G of Dr.
Evans' Report; and Mr. Steel, in reply to some questions of mine, explicitly states of
his experiments that "the phenomena induced by inoculation were those of 'surra'"
and "all inoculated animals died of 'surra' pure and simple, with the exception
of one case in which pyæmic complications" ensued some days before death.
According to these data, which, if not numerous, are still decided and clear, it
would follow, first, that both visible blood-contamination and a certain group of
symptoms are transmissible by artificial means from the diseased equine to
healthy ones of the same species; and, secondly, that a similarly contaminated
state of the blood may be transmitted from the "surra" equine to the dog and
monkey. That to these non-equine animals, however, the "surra" disease had
always been simultaneously communicated, is not so clear, for the records
bearing on this important point seem too few and incomplete to be quite con
-vincing. Thus, while the two dogs inoculated by Dr. Evans both showed on the
11th day a kind of leukhæmia (and one the hæmatozoon scantily) with pallor
and emaciation, yet there was |no jaundice or petechial rash; and, moreover, a
sucking pup, which on several occasions displayed abundant blood-organisms,
continued in good health for at least 18 days. The dog, too, inoculated by Mr.
Gunn did not for days or probably weeks show any signs of illness whilst the
blood contained active monads. Continuous records are, however, wanting, and
the end was not known. The two positive data of Mr. Steel include, first, a
young dog both inoculated and fed on tainted mule's flesh; organisms seen in
blood on 12th day, but no signs of general disorder until the 16th; when and
after the animal was dull, feverish, with very pallid conjunctivæ, a slight cough
and tenderness in the loins, appetite capricious, many parasites in the blood at
times: 28 days later there were noticed fever, emaciation, with glandular swellings
on each side of the head and in the left groin, with a state of general tenderness;
in the blood many disintegrated corpuscles, but no parasites: the buboes in-
-creased, œdema of the lower limbs, with persistent fever and tendency to collapse,
death ensuing on the 51st day after inoculation. The autopsy was made too late
for useful results. Next, a monkey had a syringeful of tainted mule's blood
injected beneath the skin of the thigh: 3 days afterwards high fever and or
-ganisms in the blood, which lasted 4 days, subsiding on the 5th, but recurring