182 ON DEATHS IN THE GARDENS IN 1920. 



houses and enclosures. In 1913 there were 31 deaths of this 

 disease, of which 15 came from an epidemic in what is now 

 called the Rodent House, so that, deducting the epidemics, there 

 is a slight rise in the death-rate from tubercle this year as com- 

 pared with 1913. 



Of the 26 cases occurring this year, seven only had been in the 

 Gardens less than six months, and of two the date of arrival 

 was accidentally omitted. Of the remaining 17, eleven had been 

 in the Gardens over a year and a half. One, a blesbok, had 

 been there nine years. 



It is therefore difficult on these figures to give any opinion as 

 to the method of the introduction of the disease to the Gardens. 



The small death-rate among the birds may have the same 

 origin as that of mycosis. 



13 a. Among the cases of mammalian tuberculosis was that of 

 an axis deer with disease of the genital organs, which is extremely 

 rare in the lower mammals. The animal had been in the Gardens 

 for many years. 



