122 NEW YORK ZOOLOGICAL SOCIETY. 



* 



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

 erately well marked and paralysis of the extremities was com- 

 plete when the animal was killed. No trophic ulcers had devel- 

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

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

 as a normal one would. 



The gross examination of the cord and brain showed nothing of 

 note, and the internal viscera were normal, except for a general 

 deficiency in fat. 



MICROSCOPIC EXAMINATION. 



Brain. — Sections taken through the left motor cortex showed 

 nothing noteworthy, except a general dilatation of the lymph 

 spaces. No degenerated fibers are present in either the sub-corti- 

 cal white matter or in the left internal capsule. Cord. — The mem- 

 branes of the cord are normal. 



Medulla. — Sections prepared by the Busch-Marchii method 

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

 among the arcuate fibers and in the neighborhood of the nucleus 

 gracilis and cuneatus. A few degenerated fibers are also pres- 

 ent in the fillet. There is general dilatation of the lymph spaces. 



Cervical Cord. — The lymph spaces are generally dilated, but 

 otherwise the general structure is not altered. Sections prepared 

 by 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 af- 

 fected. There is also a marked general degeneration in the fibers 

 of the direct cerebellar tract and a few scattering degenerated 

 fibers in the antero-lateral tract, also an occasional one in the direct 

 pyramidal and in the anterior ground bundle. 



Sections stained by the method of Neisl show a general chroma- 

 tolysis 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 upper dorsal levels show 

 alterations similar to those found in the cervical segments as re- 

 gards the degenerated tracts, except that the column of Burdach 

 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 



