DISEASES OF THE LYMPHATIC TISSUES 133 
according to the figures, but the high percentage for the 
former is due to the frequency with which tuberculosis is 
met in the Primates. With this order deducted there is 
no doubt that the avian spleen has a greater vulnerability 
for the tubercle bacillus than has the mammalian organ. 
Rodentia as a mammalian order stand next to the 
Primates, whereas the Camivora and Ungulata relatively 
seldom show splenic tuberculosis. Among the Aves one 
finds that Columbae, Galli and Accipitres have the highest 
splenic susceptibility, but beyond this one hardly dare 
venture because of the irregularity in the number of 
specimens seen at autopsy. Suffice it to say that a greater 
number of cases of tuberculosis are seen in the spleen 
of the class for which the intestinal origin of tuberculosis 
appears most important. 
In the cases of actinomycosis and its congeners, such as 
the Kangaroo maxillary mycosis, which we have seen at 
the Garden, no specific changes have been seen in the 
spleen, unless a single or double nodule of the same variety 
as the original focus may be considered specific. Such was 
found in two cases, one a tapir with low grade inactive 
actinomycosis, the other a kangaroo with maxillary strep- 
tothricosis. Two deer came to autopsy with a gross 
picture suggestive of anthrax; no bacilli could be found 
in the semifluid spleen, but a member of the hemorrhagic 
septicemia group was found. The latter group of infec- 
tions has been fairly well represented, although not in 
epizootic form, and the almost invariable splenic change 
has been that already discussed as diffuse splenitis. 
Three secondary tumors are recorded, two cancers and 
one renal adenoma. 
