108 DISEASE IN WILD MAMMALS AND BIRDS 
years in a study of this clinico-pathological complex in 
the human being, such cases have been searched for most 
diUgently, but without success. The New York Zoological 
Park records a case of Hodgkin 's disease, without specifi- 
cations, in 1901, and at the London Garden a pseudo- 
leucemia was found. The paucity of leucemia and 
of the aleucemic adenopathies in lower animals and 
their relative frequency in man excite speculation as 
to their interdependence; but more of this under 
the lymphatics. 
Avian Leucemia. 
The class Aves is rather better represented in the 
group of leucemias, but here the well known infectious 
disease may confuse the picture. The birds affected were 
Psittaci 3 (1 parrot, 1 parrakeet, and 1 amazon), Herodi- 
ones (stork) 1, and Galli (Gambel's quail), 1. There was 
no close association of these cases either in time or hous- 
ing. One of the parrots and the stork had a picture 
suggesting that given by Warthin for avian leucemia 
while the remainder presented greater evidence of a 
generalized infection, such as Moore described, associated 
with the finding of the B. sanguinarium ; this organism 
was isolated once, but no secondary cases succeeded upon 
the death of this bird. It seems hardly profitable to quote 
protocols of this relatively unimportant condition, espe- 
cially since it is fairly well known. 
The separation of the two groups just specified might 
be discussed, however, for it is by no means certain that 
they are or are not different. AA^en a pathological 
picture of leucemia gives a decided impression of an 
acute infection there are very prominent involvements 
of the viscera but no lymph nodal masses. On the other 
hand, in the cases \\'ith nodular masses corresponding to 
the scanty lymph tissue of birds, there is much less infil- 
trative involvement of viscera and less parenchymatous 
degeneration. This suggests that they are different 
