28 
mals to live until the disease had become so extensive, but 
even to appear in fairly good health until within a few days 
or hours of death. In many cases they seemed as active 
and well as their healthy companions. 
Cough may be absent or but slightly marked notwith- 
standing very extensive lesions of the lungs. We have 
never observed monkeys to expectorate; if the pulmonary 
infection is primary it is probable that the intestinal and 
peritoneal lesions which were present in nearly all cases 
are in great part due to swallowing the pulmonary dis- 
charges. 
We have not observed pulmonary hemorrhage in mon- 
keys, either during life or at post mortem examination; and 
Mr. Arthur E. Brown informs us that during his long con- 
nection with the Gardens, he has never observed pulmonary 
hemorrhage in monkeys or in any other wild animals. The 
absence of hemorrhage in monkeys is in part due to the fact 
that they are usually affected by the miliary form of tuber- 
culosis, without ulceration, destruction of tissue and the 
formation of cavities. AVe have not found a pulmonary 
cavity in any of the monkeys thus far examined. 
An unusual number of monkeys died of tuberculosis 
during the first half of the period covered by this report. 
This was an old lot of monkeys, which had been in the 
Gardens for several years. The number here recorded does 
not, therefore, represent the average death rate from this 
disease. Notwithstanding the careful disinfection of the 
house and cages, and the isolation of suspected individuals, 
before the introduction of new animals, it seems at present 
to be impossible to prevent a considerable mortality among 
monkeys from tuberculosis. 
Non-tubercular pulmonary diseases, pneumonia and 
pleuritis, were found most frequently in monkeys. 
Enteritis was found in a number of animals and probably 
has occurred more often than is indicated in the report, as 
a careful microscopic examination of the intestines was only 
made when there were no more obvious lesions to account 
for the death. In case 64, the black spider monkey, the 
