NINTH ANNUAL REPORT. 155 



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 myel- 

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

 tions of the cord. 



Cauda Equina.— Seci\ons 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 portion 

 of the spinal canal, extending rapidly upward. 



Case it. 



Coinuioii 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. 



The wasting of the muscles of the rear extremities was mod- 

 eratelv well marked and paralysis of the extremities was com- 

 plete when the animal was killed. Xo trophic ulcers had devel- 

 oped and the bodv was not extremely emaciated, for the animal 

 had continued to take its food fairly well, though not sd anxiously 

 as a normal one would. 



The gross examination of the cord and brain showed nothing of 

 note, and the internal viscera were normal, t'xcept for a general 

 deficiency in fat. 



MICKO.SCOPIC EXAMIXATIOX. 



Brain.— Sections taken thmugh the left motor cortex showed 

 nothing noteworthy, except a general dilatation of the lymph 

 spaces. Xo degenerated fibers are present in cither the sub-corti- 

 cal white matter or in the left internal ca])sule. Cord. — 'I he mem- 

 branes of the cord are normal. 



Medulla. —Sections prepared by the lUisch-Marchii method 



