180 DR. N. S. ifflCM OX %G '•' 



mycosis will shed some light on this fall. How much of this 

 diminution in the incidence oLtha&a, diseases, is-rdue. tqthe. birds 

 being less crowded it is difficult to say,., 11 the numbers ol^ birds 

 rise to pre-war height, it willlie intei'estii^ I,: tO'whtch''' the'' corre- 

 sponding effect on these diseases. h5i30d Siil < -S tSi^OlOi! iJ» j 



The decrease in the death-rate among the reptiles is still more 

 marked, being nearly half, even when- hewly-impdit.ed individuals 

 are considered. This is due to the absence of an epidemic of 

 pneumonia, which in 1913 claimed 138 victims, while 1 the total 

 deaths from lung diseases for 1920 is 61. 



If only the more acclimatized specimens are considered, the 

 death-rate is remarkably low. This is probably due to the fact 

 that those which had been in the Gardens for more than six 

 months were mostly reptiles which had survived the difficult 

 period of the war and were rather specially well acclimatized. 



Notes on the Analysis of the Causes of Death. 



1. Pleurisy. — It is interesting tomoto the -rarity of this disease 

 among animals in comparison with its common .incidence - among 

 humans. ... . . .... , 



One case occurred an a green cercopitheque. the, other in a 

 macaque. 



2. This occurred in a grey ''mongoose. ' "'"' • Q ;'-- r , : ' 



3. This was found in an Indian hunting-dog; and whs due' to a 



»• 



nematode, Spiropterkt s M&nguinolentai "0 j 



4. This occurred in a Burnett's* cercopitheque. 



5. It. is difficult to account .for the. diminution in the. .deaths 

 from nephritis/,. The figures this y<;ar are o. 81,'ancl for the 

 three classes, wliile" in -liHS they wofe .HC 135, and, (3. At first: 

 sight it might seem thaj this was .uue to a. dinererice in opinion 

 as to the cause of death, but a's ! t'here'has been : 'nO" corresponding 

 rise in any other disease or diseases, this cannot be. the cause 

 So little is known as to the cause of nephritis, that it is impossible 

 to assign a reason. 



6. In a budgerigar. 



7. Enteritis still remains' the chief cause of death among the 

 birds.. One organism, that of B. aertryck. lias been isolated -from 

 a newly-imported grpy touracou and a newly-imported parrakeet. 



8. These occurred in a ring-tailed lemur, a badger, and a 

 bonnet macaque. 



9. In a black-backed jackal. 



10. In a bonnet macaque. This was an old individual. 



11. In a fairy blue-bird. 



12. In a violet tanager. 



13. The high death-rate from tuberculosis among the mammals 

 as compared with that of birds is of interest. 



Among the mammals 69 deaths occurred, of which 43 were 

 those of macaques in the canal-bank aviary. Of the remaining 

 26, five occurred in the Lion House, leaving 21 for the other 



