124 NEW YORK ZOOLOGICAL SOCIETY. 



Degenerated fibers are also found in the anterior nerve roots. Ex- 

 amination of the ganglion cells of the anterior horns shows very 

 marked atrophy, in many cases amounting to actual cytoclasis. 

 Others of the cells are elongated, the chromatic plaques are miss- 

 ing and the cells show atrophy to a marked degree. 



Dorsal Cord. — The descending degeneration present in the cer- 

 vical segments is also present in the dorsal cord, and in addition 

 occasional degenerated fibers are present in the columns of Goll 

 and Burdach. The ganglion cells of the anterior horn in these 

 levels show also the same marked degeneration as was found in 

 the cervical regions, but the degenerated cells are much more nu- 

 merous here than in the cervical levels. Sections of some of the 

 posterior root ganglia from these levels show atrophy of certain 

 cells, together with the degeneration of some of the fibers origi- 

 nating in the ganglia. The nerve trunks surrounding the cord 

 show a good many degenerated fibers. 



The blood vessels show no abnormality except in those areas 

 of the anterior horns where the degenerated cells appear most fre- 

 quent; here there seems to be perivascular gliomatosis of slight 

 degree. 



Lumbar Cord. — Alterations in the lumbar cord do not differ 

 from those found in the cervical and dorsal levels. 



Conclusions. — A descending degeneration with poliomyelitis is 

 disseminated throughout the cord, becoming more marked in the 

 lower levels where the posterior root ganglia are also involved, 

 causing degeneration of isolated fibers in the ascending tracts. 



It is a little difficult to reconcile the degenerations found in 

 this cord without assuming some disease of the encephalon, and in 

 all probability this was present. It is probable, however, that the 

 lesions that give rise to the most marked symptoms were the polio- 

 myelitic changes. 



Case iv. 



Macacns nemestrinus. — The animal exhibited the atrophies in a 

 moderate degree, and the disease was of rather recent onset. The 

 animal was killed by chloroform and the general post-mortem 

 examination showed nothing of note. No gross alterations were 

 evident in the brain or cord. 



Microscopically, the lesions present throughout the cord con- 

 sisted of an atrophy and degeneration of the cells of the anterior 

 horn, particularly in the lower dorsal and lumbar regions, but 

 present also, though in lesser degree, in the cervical levels. 



Occasional degenerated fibers were found, scattered irregularly 



