732 DR JAMES W. DAWSON ON 



Plate LIX (Case VIII) (pp. 715-717). 



Figs. 202-217. Levels of the pons, medulla oblongata, and spinal cord. Kulschitsky-Pal with picro- 

 fuchsin. Note the marked involvement of the spinal cord from the cervical enlargement downwards, and 

 the comparative integrity of the remaining portions of the central nervous system. 



Figs. 202 and 203. Upper cervical cord (C3 and CI). x 2. 



Fig. 204, x 2. Medulla oblongata above the decussation of the fillet ; diffuse staining of the tissue 

 between the inferior olive and the substantia gelatinosa Rolandi on each side. 



Fig. 205, x 2£. Middle medulla with cerebellum. Early areas in both restiform bodies ; section 

 otherwise normal. 



Fig. 206, x 1\. Lower pons ; areas lie mostly in the cerebellar portion, and small areas are related to 

 the zone of entry of the Vlllth nerve on both sides. 



Fig. 207, x 2£. Upper pons ; shows only two small areas which lie in the pontine grey matter and 

 middle cerebellar peduncle. 



Fig. 208, x 2|. Pons — level of decussation of the superior cerebellar peduncles; antero-lateral area 

 involving superficial transverse fibres, pontine grej r matter, and pyramidal fibres ; also slight peri-aqueductal 

 sclerosis. 



Figs. 209-217. Various levels of the spinal cord. Note the advanced degree of sclerosis of the cervical 

 enlargement and dorsal cord ; few of the levels showed any fat granule cells. Note also that the remaining 

 myelinated fibres (frequently peripheral) show a marked symmetry in their grouping and arrangement, 

 and that the spinal nerve roots at most levels stain normally. 



Plate LX (Case IX) (pp. 718-720). 



Figs. 218-224. Levels of the medulla oblongata and pons. Kulschitsky-Pal with picro-fuchsin. x 2 

 (fig. 221, x 1). Note the extensive, involvement of the lower medulla, but that the areas in the upper 

 medulla and pons are few and are related specially to the angles of the ventricle, to the adjoining cerebellar 

 white matter and folise, and to the superior cerebellar peduncles. 



Figs. 218-220. Lower medulla. Note the symmetry of the involvement. 



Fig. 221. Upper medulla with cerebellum. 



Fig. 222. Pons Varolii — upper third — areas are specially related to the angles of the ventricle, pass on 

 both sides into the middle peduncles, involve several of the adjoining cerebellar folise and the motor and 

 sensory Vth nuclei. 



Fig. 223. Upper limit of pons ; peri-aqueductal tissue now normal. 



Fig. 224. Pons — level of inferior corpora quadrigemina. 



Fig. 225, x 2. Horizontal section through optic chiasma; narrow zone of complete demyelination in 

 anterior margin of chiasma and along the inner border of one optic nerve— the rest of the tissue stains faintly. 



Fig. 226, x 2. Frontal longitudinal section through segment of dorsal cord. 



Fig. 227, x 2. Posterior root ganglion related to previous figure. 



Figs. 228-239. Various levels of the spinal cord. Kulschitsky-Pal with picro-fuchsin. x 2. Note the 

 extensive affection of the lower sacral segments (figs. 238, 239), and the symmetry present in the small 

 areas found in the lumbar cord — especially in those which involve groups of anterior horn ganglion cells 

 (figs. 236, 237). 



Plate LXI. 



Figs. 240-249. Transverse sections of the cord from various cases to illustrate special features of indi- 

 vidual areas. Kulschitsky-Pal with picro-fuchsin. Figs. 240-243, x 10 ; figs. 244-249, x 6. 



Fig. 240. Sixth cervical segment. Note complete preservation of nerve roots. 



Fig. 241. Fifth lumbar segment. Note lateral vessels (a) passing to the postero-lateral projection of 

 the anterior horn (c/. fig. 253). 



Fig. 242. Fifth lumbar segment, a = involvement of the glious, extra-medullary portion of posterior 

 nerve root. 



