No.419.] SPECIFIC ANTI-BODIES IN THE BLOOD. 929 
serum of a rabbit which had been fed for twenty-four days 
with white of egg. 
Leclainche and Vallée treated animals with albuminous 
urine and found that the serum of the treated animals con- 
tained a precipitin which acted upon the albuminous human 
urine with which they had been treated but not upon albumi- 
nous urine from the cow and horse. 
Uhlenhuth treated rabbits with human blood and that of the 
ox, and observed the formation of specific precipitins in their 
serum which was tested on nineteen bloods derived from dif- 
ferent animals. He obtained a reaction with a solution made 
from human blood which had been dried one month. Wasser- 
mann and Schütze made similar observations, testing twenty- 
three kinds of blood. Stern, who also experimented along 
these lines, found that the blood of three species of monkey 
gave a slight reaction with the serum of rabbits treated with 
human blood. In addition to other observations of a con- 
firmatory character Mertens has found that the blood of a 
young rabbit born of a human serum-treated mother also 
contained the specific precipitin in its blood. The last obser- 
vations which I shall mention are those of Dieudonné, and of 
Zuelzer, whose results are merely confirmatory in character. 
The majority of the publications referred to have appeared 
since I began my researches in January. 
I have injected rabbits intraperitoneally with the serum of 
man, the ox, sheep, horse, dog, and cat, and have been able 
to observe the formation of anti-bodies in the sera of all the 
rabbits excepting those treated with cat serum. The anti-sera 
have been tried on forty-five kinds of blood. ? 
The serum of rabbits treated with dog serum, added we 
these bloods, gave a negative reaction throughout, excepting 
in the case of the dog. The tested dog blood was ades sp 
dissolved in salt solution or used in the form of diluted fluid 
1 Full details of these experiments will appear in the forthcoming number of 
the Journal of Hygiene, vol. i (July 1), No. 
2Since the above was written, over one 
Fully realizing the interes 
the study is 
5; 
hundred and forty bloods have been 
tested — with uniform results. to a i 
the point of view of zoólogical classification, being pu 
extensive scale. 
