NINTH ANNUAL REPORT. 157 



usual ascending degeneration above. Aside from this the cord 

 seems to have been normal and the cause of the myelitis is not 

 apparent. 



Case hi. 



Vervet Monkey (Ccrcopitliecus lalandii). — The animal pre- 

 sented the general clinical manifestations of cage paralysis. Six 

 weeks elapsed between the time of the first observation of the dis- 

 ease and the death of the animal. During this period the monkey 

 emaciated moderately and progressive atrophy of the rear extrem- 

 ities have become marked. 



The autopsy, which was performed by Dr. Blair, showed mod- 

 erate general emaciation with marked atrophy of the hind ex- 

 tremities from the pelvis down. There was a large deep indolent 

 appearing ulceration of the tissues over each tuberosity of the 

 isc/tiiun. The heart was in diastole and normal. The lungs were 

 normal. The liver was congested. The kidneys were moderately 

 congested. The bladder was well filled with urine and was other- 

 wise normal. The stomach, pancreas and intestines were normal 

 throughout. Brain and Spinal Cord. — Gross examination shows 

 no lesions in either brain or cord. 



MICROSCOPIC EXAMINATION'. 



Cervical Cord. — Microscopically, the spinal cord in the cervical 

 region shows a considerable number of degenerated fibers in the 

 direct and crossed pyramidal tracts and in the antero-lateral tracts. 

 Degenerated fibers are also found in the anterior nerve roots. 

 Examination of the ganglion cells of the anterior horns shows 

 very marked atroph}-, in many cases amounting to actual cyto- 

 clasis. Others of the cells are elongated, the chromatic plaques 

 are missing 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 orig- 

 inating in the ganglia. The nerve trunks surrounding the cord 

 show a good many degenerated fibers. 



