562 DISEASE IN WILD MAMMALS AND BIRDS 
stain indifferently well, surrounded by a dense zone of 
fully formed mould beyond whicli mononuclear cells and 
a few loose fibrils may be found. The circimaferential 
tissue of the viscus supplies a mild congestion and per- 
haps a moderate connective tissue capsule. Giant cells, 
as knowai for tuberculosis, do not appear. 
Where the process involves loose tissue like the lung, 
especially when growing rapidly, the sporulating heads 
of the mycelia stretch out in advance of the main mass 
and resemble rays. So too in a rapidly growing nodule 
radiating mycelia are sometimes seen but never with the 
regularity of arrangement typical for actinomycosis. 
Diffuse and irregular mycelial spread is characteristic 
of the second or infiltrative type of lesion and between the 
mould stalks one may discover well-preserved tissue cells 
and at times bacterial forms like cocci or bacilli. This 
picture, suggesting as it does bacterial admixture and 
more active inflammation, leads one to the conclusion that 
the morbid process in which it is found does not represent 
mould disease per se, but a mixed infection. Whether or 
not the bacterial disease exists first and paves the way for 
the mould I am unprepared to say; I am inclined to the 
view that mycosis can start by itself. 
Incidence in Avian Orders. 
Mycosis may be said to occur in all birds although the 
appended list fails to show cases in a few of the orders 
included in this study; the sum total of autopsies from 
missing orders is only 45, so that they may be ignored. 
per 
cent. 
per 
cent. 
Passeres 
Picarise 
Psittaci 
Striges 
Accipitres 
Columbas 
Galli 
3.7 
1.2 
3.9 
6.7 
5.1 
.6 
2.7 
Fulicariae 
Alectorides 
Gaviae 
Impennes 
Herodiones 
Anseres 
Struthiones 
8.6 
2.7 
10. 
40. 
2. 
6. 
9.4 
For meaning of italics see foot note Table I. 
