930 THE AMERICAN NATURALIST. [Vor. XXXV. 
serum. Whereas a marked and almost immediate precipi- 
tation occurred on the addition of the specific anti-serum to 
dog's blood, all the other blood solutions remained perfectly 
clear. 
The serum of rabbits treated with sheep serum only pro- 
duced a marked precipitum with sheep serum or blood solution. 
All the other sera and bloods remained perfectly clear, except- 
ing those of the axis deer, gazelle and ox, in which a slight 
reaction took place, and those of the squirrel and swan, in 
which there was very slight clouding. 
The serum of rabbits treated with ox serum only produced 
a marked precipitation in ox-serum dilutions, or dried ox-blood 
solutions. All the other bloods gave a negative reaction, a 
slight clouding only being produced in blood solutions of the 
sheep, gnu, axis deer, and gazelle, a slight opalescence appear- 
ing with that of the squirrel and swan. 
The serum of rabbits treated with horse serum only produced 
precipitation in dilutions of horse’s blood or serum, not even a 
clouding in any of the other bloods noted. 
The serum of the rabbits treated with human blood, serum, 
and pleuritic exudation, only produced a marked precipitation 
in human blood solutions, etc. The blood of the four monkeys 
gave a slight but distinct reaction. A very faint clouding at 
times appeared in the solutions of the bloods of the horse, 0X; 
and sheep, whereas all the other bloods remained perfectly clear. 
The test gave positive results when made with diluted human 
serum, pleuritic exudation, both fresh and putrid, blood and 
serum which had been dried on filter-paper and on glass plates, 
with blood which had undergone putrefaction for two months, 
with the blood of several persons who had cut themselves 
(blood collected on filter-paper), and with the serum from à 
blister following a burn on the hand and pressure on the foot. 
Both nasal and lachrymal secretion gave a slight but decided 
reaction. A faint clouding was produced in normal urine. 
That the precipitum formed in putrid blood dilution was Spe 
cific was proved by adding the anti-sera of rabbits treated 
with ox, sheep, and dog serum to the blood dilution, no 
reaction resulting. 
