STREPTOCOCCI IN COMPARATIVE PATHOLOGY. 
855 
varieties of streptococci which may exist.” The committee 
found nothing in the literature or in their own experience to 
indicate that its employment will materially improve the 
general results in the treatment of streptococcus puerpural in¬ 
fection. 
If this is the case in human medicine where, as I have 
already stated, there is a better knowledge of the action of the 
streptococci, how can we expect better results from similar 
methods in veterinary medicine ? Our own experiments sug¬ 
gest further that the procuring of a serum of recognizable value 
from any of the virulent streptococci is not in all cases, even 
experimentally, easily accomplished. It seems just, both to 
the bacteriologist and to the practitioner, that the investigations 
should be continued until we are in possession of more definite 
and trustworthy results concerning the action of the serums 
prepared from different streptococci on the diseases produced by 
the same species, before veterinarians become too eager to risk 
their reputation or the money of their clients in a general and 
unscientific application of these expensive remedies. If, how¬ 
ever, the results of the investigations directed towards the pro¬ 
duction of a poly virulent serum by using all known streptococci 
in its preparation succeed, we may yet have a single product 
which will be efficient in the healing of each and all of the 
streptococci infections. The accumulated evidence at the 
present time points, (i) to the probable high efficiency of certain 
anti-streptococcic serums against the diseases produced by the 
same streptococcus and, (2) that these same serums are likely 
to have little or no value in diseases caused by other strepto¬ 
cocci or other genera of bacteria. If this interpretation of the 
recorded results is the correct one, additional reasons for the 
necessity of a careful differentiation of the streptococci liable 
to be present in animal diseases where this remedy is to be ap¬ 
plied are too obvious to need further explanation. 
Finally, it is evident from the conflicting records concerning 
the morphology and the etiological significance of streptococci 
in the domesticated animals, that much work must yet be done 
