STREPTOCOCCI IN COMPARATIVE PATHOLOGY. 
775 
ence of agglutinated fat globules, pus cells, and often red blood 
corpuscles. 
The literature on infectious mastitis and inflammations of 
the udder in which a specific infection is more doubtful, is too 
voluminous to be reviewed in the limits of this paper. A num¬ 
ber of bacteria* have been found associated with these lesions 
and quite naturally considered of more or less etiological value. 
The results of Kitt, Nocard, Mollereau, Guillebeau, Zschokke, 
Bang and still others in which a Bacterium , a Micrococcus , a 
Staphylococcus , and a Streptococcus have been found and re¬ 
ported as standing in a causal relation to the trouble indicate 
that a variety of microorganisms are active in producing those 
affections which are frequently grouped without distinction as 
infectious mastitis. The review of much of the literature on 
this subject, shows that a number of cases reported as infectious 
were isolated or sporadic ones, ?>., they were in dairies where 
the disease did not spread to other animals. While these may 
be truly infectious in their nature they should be differentiated 
from the rapidly spreading phlegmons which are easily recog¬ 
nized as infectious (contagious). 
If we take into account the variety of anatomical changes 
which have been described in the various udder affections, we 
can reasonably admit that different agencies may have been in¬ 
strumental in their production and that the various species of 
bacteria which have been isolated from the udder lesions may 
very likely have been of etiological importance in their respec¬ 
tive cases. In former publications')* from this laboratory the 
* Among the bacteria which have been found in udder trouble and described as the 
possible or perhaps the more probable cause the following species may be mentioned. 
Bacterium phlegmasia; uberis (Kitt). 
Streptococcus agalactia contagiosa (Nocard, Mollereau, C.uillebeau, Zschokke). 
Staphylococctis mastitidis (Guillebeau). 
Galactococcus versicolor “ 
‘ ‘ fulvus ‘ ‘ 
“ albus “ 
f Moore, V. A., and Ward, A. R. Bulletin No. 158, Cornell University Agricultural 
Experiment Station. 
Ward, A. R . Journal of Applied Microscopy, Vol. I. (1898) p. 205. 
