382 DISEASE IN WILD MAMMALS AND BIRDS 
matter. These do not present the dense colonization often 
seen in the acute cases of infantile paralysis in man but 
are prominent in comparison to normal nervous tissue. 
Hemorrhages or at least small groups of erythrocytes 
outside of blood vessels are seen here and there. Vacuoli- 
zation of ganglion cells is variable, being prominent in 
some, trifling or absent in others. G-lial proliferation is 
often quite marked, and in one case to be cited seems the 
prominent lesion. 
The animals in which meningopoliomyelitis has been 
found were three monlveys, two Canadian lynx, a bear and 
a raccoon; about a score of cords from other animals 
with some kind of palsy have been studied microscopically 
without discovering it. The following cases illustrate our 
material. The only instance of two cases in close relation 
concerns the lynx {Felis canadensis). They occupied the 
same cage and died twelve days apart. No symptoms 
were recorded until a few days before death when a 
general paralysis appeared, deepening to completeness on 
the day of death. No case occurred in neighboring cages. 
Doctor Rhein studied all these cases, and his notes are 
used for these records. Portions of the lumbar and cervi- 
cal enlargements and of the thoracic regions of the cord 
were stained with hemalum and acid fuchsin and with 
thionin. The pia was slightly infiltrated. There was 
some cellular infiltration of the anterior septum, and the 
vessels here showed an increase in the nuclei of the walls 
and a slight perivascular infiltration. The pial infiltra- 
tion seemed to be equally distributed in the entire circmn- 
ference of the cord, although perhaps a little more 
marked over the anterior and posterior septa. The ves- 
sels of the gray matter were congested and the walls of 
the vessels in most part sho^ved a proliferation of the 
nuclei. There were a few small hemorrhages into the 
gray matter, probably agonal. As compared with the 
human cord and the cords of monkeys, antelopes and 
dogs, there was an unusually large number of gha nuclei, 
