THE AIR SAC MITE OF THE FOWL. 
n 
gressed so far that the bird was scarcely able to walk, the plum¬ 
age was devoid of lustre, the bird wasted to a mere skeleton, the 
comb and wattles pale, bloodless, shrunken, respiration quick¬ 
ened, difficult and accompanied by a rattling noise. 
The bird was killed by bleeding. The autopsy revealed an 
exceedingly emaciated, anaemic body; the body cavity contained 
a quantity of a thickish dirty gray pap-like fluid. The mesen¬ 
tery showed numerous dark, almost black spots one-eighth to 
one-fourth inches diameter. Everywhere in the air sacs were 
found many cytodites ; the surface of the liver, kidneys and pel¬ 
vis were thickly dotted over with the parasites. The right 
lung was inflamed throughout and the greater portion of its tis¬ 
sue firmly hepatized. The bronchi were highly inflamed and 
filled with a tough white mucous in which living cytodites 
swarmed, penetrating into the smallest bronchioles traceable 
with the naked eye. The parasites were also found in the 
scapulo-humeral extension of the air sac. Testicles were greatly 
atrophied, being as small as an ordinary peanut. 
Case No. 6. Cytodites Nudus, associated with the lesions 
apparently not due to their presence. Subject property of W. 
E., a small grade Plymouth Rock hen, one or two years old, had 
been ailing for some weeks, was emaciated, dull, weak, and on 
the morning of October 22d was found unconscious and ap¬ 
parently dying. One eye contained a chaff surrounded by a 
diphtheric membrane. After bleeding, an autopsy revealed 
great numbers of cytodites in the air sacs. The liver enormously 
enlarged, weighing 93 grammes, mottled chocolate and dirty 
yellow in color, and contracting numerous adhesions to the con¬ 
tiguous organs. A small blood clot was present and attached to the 
surface of the supero-internal faee of the left lobe of liver and a 
similar clot near the entrance of the vena porta, indicating 
recent hepatic haemorrhages. Spleen enlarged, oblong, weigh¬ 
ing 60 grammes, red and yellow mottled. 
From this hen were taken living parasites, which were used 
in experimental transmission in cases 7 and 8. 
Case No. 7. Attempted transplantation of cytodites from im 
