156 >-E^V VORK ZOOLOGICAL SOCIETY. 



show no degenerated fibers in the pyramids, but a few are present 

 among the arcuate fibers and in the neighborhood of the nucleus 

 gracilis antl ciuu-atus. A few degenerated fibers are also 

 present in the tilKt. There is general dilatation of the lymph 

 spaces. 



Cervical Cord. — The l\niph spaces are generally dilated, but 

 otherwise the general structure is not altered. Sections prepared 

 bv the Busch-Marchii method show a great many degenerated 

 fibers in the posterior tracts, particularly in the column of Goll. 

 The most radial fibers in Burdach's tract do not seem to be 

 affected. There is also a marked general degeneration in the 

 fibers of the direct cerebellar tract and a few scattering degen- 

 erated fibers in the antcro-lateral tract, also an occasional one in 

 the direct pyramidal and in the anterior ground bundle. 



Sections stained b}- the method of Xeisl show a general chroma- 

 tolvsis in the cells of the anterior horns ; the alteration is so gen- 

 eral that it is likely largely due to post-mortem changes. 



Dorsal Cord. — Sections through the ui)per dorsal levels show 

 alterations similar to those found in the cervical segments as 

 regards the degenerated tracts, except that the column of lUirdach 

 is relatively more involved. 



The mid-dorsal region presents an area of myelitic softening in 

 which all the structures of the cord are extensively necrosed and 

 the entire mass is permeated by extravasated blood mingled with 

 broken-down masses of myeline. 



The lower dorsal segments show extensive degeneration of the 

 direct and crossed pyramidal tracts and numerous degenerated 

 fibers in the anterio-lateral and the anterior ground bundle ; a few 

 scattering degenerated fibers are also present in the posterior 

 tracts, but these cnlnmns are in general free from degenerations. 

 The blood vessels in the grey matter are quite extensively con- 

 gested and areas of myelitic degeneration are frequent. 



Lumbar and Sacral Cord. — The degenerations i)resent are al- 

 most exclusively limited to the descending columns. 



Posterior Roof Ganglia. — Xo alterations are evidi-nt above the 

 level of myelitis. Ganglia corresponding to the area of soften- 

 ing show a few small patches of cellular exudation and a shrink- 

 age of some of the ganglion cells. 



Blood I'csscls. — The blood vessels throughout the spinal cord, 

 with the exception of the area of softening, slidw no apjiarciit 

 changes. 



The case is clearly one o{ transverse mwlitis of tlie mid-dorsal 

 cord with the flescending degenerations below (he lesion and the 



