148 
EXPERIMENTAL PATHOLOGY. 
EXPERIMENTAL PATHOLOGY, 
\ i \ 
MECHANISM OF THE DEATH OF RABBITS FOLLOWING TRANS¬ 
FUSION WITH THE BLOOD OF DOGS. 
By G. Hayem. 
Ch. Richet and Hericourt have been engaged in researches 
into the weak resistance of rabbits when injected with the 
blood of dogs. In examining into the mechanism of death 
when thus produced, it is seen that it takes place by asphyxia, 
resulting from the stoppage of the blood in the right heart, 
which is filled with cruorical concretions. It is in fact because 
the hematies of the rabbit are dissolved by the serum of the 
dog; there is destruction, en masse , of the red corpuscles, and 
it is evident that, in the rabbit at least, the blood in solution 
stimulates the formation of large thromboses. These facts 
belong to the order of those which the author has before de¬ 
scribed under the name of concretions by precipitation. These 
investigations of the effects of the mixture of the two kinds 
of blood will help to throw light upon the pathogeny of 
thrombosis and of embolisms of dyscrasic origin.— Rev. de Sc. 
Med. 
ON A NEW TUBERCULOUS BACILLUS OF CATTLE. 
By J. Courmont. 
This differs much from the bacillus of Koch. It always 
kills rabbits and guinea pigs, and though found in the blood 
of the animals thus destroyed, does not, except in certain con¬ 
ditions, produce lesions of a tuberculous character. It may, 
however, give rise to similar deposits in one or several spe¬ 
cies of animals, remaining at the same time inert in respect to 
others. In one species it will always reproduce tubercles, if 
obtained from a tuberculous lesion, if taken from another cul¬ 
ture, but will produce tubercles only at a certain epoch of its 
growth, age appearing to be one of the factors of this pro¬ 
perty. 
The power of producing tubercles cannot be considered 
as a simple attenuation of its virulency, as the attenuated ba- 
