EIGHTH ANNUAL REPORT. 121 



The vessels of the cord are injected and a few of them show 

 a slight exudate of small round cells into the adventitia. 



Sections prepared after the Marchii method show occasional de- 

 generated fibers, chiefly in the posterior tracts and most numerous 

 in the column of Goll. Occasional degenerated fibers are also 

 found in the descending tracts, but nothing like a systematic de- 

 generation is evident in them. 



Sections stained with the Neisl blue, show a very general dis- 

 integration of the chromatic plaques of the ganglion cells, some 

 of them are still evident but show lack of staining affinity, others 

 show a finely granular disintegration of the plaques. These evi- 

 dences of degeneration are very general and in some places amount 

 to actual cytoclasis ; it is more than probable that many of the 

 alterations are of post-mortem origin. 



Dorsal Segments. — Series of sections taken in the upper, mid 

 and lower dorsal segments show alterations very like those de- 

 scribed in the cervical region, except that the lesions increase in 

 intensity as the lower levels are reached and, though altogether 

 similar to those described in the cervical regions, are of much 

 more marked degree. In the lowest dorsal segments the cellular 

 exudate is found passing into the cord with nerve roots. 

 . Lumbar Cord. — In some places the meningeal exudate has so 

 infiltrated the cord that practically a condition of transverse mye- 

 litis exists, otherwise the lesions are like those of the superior por- 

 tions of the cord. 



. Cauda Equina. — Sections show a very marked general small 

 round-cell exudation about all the nerve fibers. Well-formed tu- 

 bercles are frequent and in some cases have caused complete 

 necrosis of the normal structures. 



Posterior Root Ganglia. — Sections of the posterior root ganglia 

 of the lower levels show also an intense productive inflammation 

 apparently following the nerve trunks. Degenerated nerve fibers 

 are not numerous even in those of the cauda equina, and from the 

 condition of the ganglion cells it seems highly probable that at 

 least a part of the degenerated fibers are due to a disease of the 

 ganglion cells. 



Conclusion. — The condition clearly originated as a tubercular 

 meningitis and the disease apparently started in the lower por- 

 tion of the spinal canal, extending rapidly upward. 



Case ii. 



Common Macaque (Macacus rhesus). — This animal formed 

 one of a large group of these monkeys and was not particularly 

 observed, except that the case was rapidly progressive. 



