THE RESPIRATORY SYSTEM 165 
be of low grade for we have had no severe and devasting 
epizootic. Mycosis is constantly with us no matter what 
we do in hygienic measures. There was a small group 
of cases of pulmonary and serous membrane mycosis com- 
bined with staphylococcus infection which carried off six 
birds. The pathology of this group was interesting 
because one could follow the infection of the bacterium. 
The anterior pulmonary ostium was surrounded or 
covered by a mycotic mass and spreading downward 
from this was a grayish yellow turbidity of the air sac 
walls with a delicate sticky or almost mucilaginous 
exudate extending into the lateral abdominal and pos- 
terior sacs. 
There is on record one tumor of the pleura, an endo- 
thelioma, in a Clouded Leopard {Fells nehulosa). It was 
the usual plate-like thickening with warty excrescences. 
No metastases occurred. (Figs. 12 and 13). 
