384 DISEASE IN WILD MAMMALS AND BIRDS 
tration. The pia of the spinal cord, however, did not 
show any cellular infiltration. The cells of the anterior 
horns of the spinal gray matter were extensively diseased, 
being swollen in places, some surrounded by a glia pro- 
liferation and many Avith marked vacuolization. 
A common raccoon {Procyon lotor) was observed in 
the laboratory to have complete paralysis of the anterior 
and partial paralysis of the posterior extremities. This 
latter was almost complete in muscles controlling the 
feet, while the thigh and liip muscles showed some irregu- 
lar incoordinate movements. Respiration shallow but 
regular. History shows that the power of the extremities 
began to fail about a month before death and was abso- 
lutely lost in the fore extremities three days before the 
animal was killed. Diagnosis : Poliomyelitis. Examina- 
tion of the central nervous system showed the presence of 
marked round cell infiltration of pia of cortex and of 
spinal cord, more particularly in the lower thoracic and 
lumbar regions. Ganglion cells in the lumbar region were 
markedly diseased. There were numerous old and fresh 
hemorrhages and a moderate degree of round cell infiltra- 
tion in the anterior horns. Two young of this animal, 
bom three months before its death, showed weakness and 
gradual increasing paralysis of their extremities begin- 
ning when three months old (that is at the time of the 
death of their mother), and lasting until their death, one 
in the seventh and one in the eighth month of life. These 
were found not to have changes in the central nervous 
system, but there was sufficient rachitis to account for 
this paralysis. 
The only tumor of the central nervous system found 
among these animals occurred in an Undulated Grass 
Parrakeet (Melopsittacus undulatus). The gross notes 
are very vague but the microscopy is suggestive of a 
glioma. The groAvth in the brain consists of large irregu- 
lar masses of large cells with vesicular nuclei and pale 
homogeneous protoplasm. "Scattered between these 
