83 



species which hitherto had been incorrectly thought 

 to require the hot house method of treatment. In the 

 Report issued in 1905 we saw that even then it liad 

 shown a decided effect for good. " The Parrots and 

 " Parrakeets in the New Canal Bank Aviary have 

 " proved a great delight to visitors, and there has been 

 "a striking decrease in the rate of mortality of those 

 " kept, even throughout the winter, in the open aviary 

 " as compared with those in the heated Parrot 

 ** House." And when the Society has extended this 

 system a little wider than they already have, they will 

 see a corresponding progression in the improved 

 effects. 



In the report just now issued we find, in the very 

 few lines devoted to this subject, matter of great impor- 

 tance and affording considerable food for thought. 

 Dr. Seligmann finds that " there have been practically 

 "no deaths due to tuberculosis amongst those 

 *' monkeys that have been left out of doors, whereas 

 *' there has been a marked mortality due to that 

 "cause amongst the monkeys in the heated monkey 

 " house." 



Then again there is a point which shows how 

 largely segregation for a lengthy period on the same 

 area affects the incidence of microbal diseases. If we 

 turn to page 282 of Vol. II. of Bird Notes, we shall 

 find the account of my post mortem examination of a 

 Grey Parrot which had died of mycosis, " a disease 

 " characterised by the presence of the aspergilljis 

 '\fumigatus (one of the mould fungi) in the air 

 " passages, air sacs, and sometimes, as in this case, 

 '* the lungs." Now this disease, which is fairly 

 frequent amongst Fowls, is so exceedingly rare 



