740 DR JAMES W. DAWSON ON THE HISTOLOGY OF DISSEMINATED SCLEROSIS. 



Fig. 443, x 50. Posterior columns of the spinal cord with similar vessels cut transversely (a) and 

 longitudinally (b). 



Fig. 444, x 250. Optic nerve ; connective-tissue septa and thickened vessels in longitudinal section. 



Plate LXXVIII. 



Figs. 445-450. Special features of the changes in the blood-vessels. 



Fig. 445. Cerebral white matter ; small dilated capillary surrounded by a zone of shadow sclerosis. 

 Kulschitsky-Pal with picro-fuchsin. x 25. 



Fig. 446. Cerebral cortex ; two dilated and thickened small cortical vessels passing into a demyelinated 

 area. Van Gieson's stain. x 50. 



Fig. 447. Dilated vessels at posterior horn of lateral ventricle. Van Gieson's stain. x 50. 



Fig. 448. Groups of vessels in a sclerotic area with very dilated peri-vascular tissue. Kulschitsky-Pal 

 with picro-fuchsin. x 10. 



Fig. 449. Similar vessels in an area 'of more advanced sclerosis. Van Gieson's stain, x 30. 



Fig. 450. Similar vessels both within the area and in the adjoining tissue. Van Gieson's stain, x 45. 



Figs. 451-454 illustrate various features in the changes in the nerve roots. Kulschitsky-Pal with 

 picro-fuchsin. 



Fig. 451, x 75. Rarefaction of the anterior nerve roots. 



Fig. 452, x 75. Normal nerve roots in the cauda equina. H.P. of next figure. 



Fig. 453, x 6. Normal nerve roots surrounding a completely demyelinated fifth sacral segment of 

 the cord. 



Fig. 454, x 6. Normal sciatic nerve in same case as previous figure. 



Fig. 455. Ependymal proliferation in wall of lateral ventricle. Heidenhain's iron-hsematoxylin. x 300. 



Fig. 456. Normal glandular portion of the pituitary body. Hsematoxylin and eosin. x 300. 



PRESENTED 

 3 I AUGJS16 



