734 DR. JAMES W. DAWSON ON 



medullary ray and radiations; c = confined to the deep cortex; d = extensive demyelination of the 

 superficial cortex. 



Fig. 271, x 7. Convolutions at the extremity of the occipital lobe ; the medullary ray and radiations 

 at the tip of both convolutions (a) all sharply cut off in an irregular line. 



Pig. 272, x 7. Convolutions at the extremity of the opposite occipital lobe of the same case as 

 previous figure, a = complete demyelination of the superficial cortex over an extensive surface; and b = 

 invasion of the deep cortex. 



Fig. 273, x 7. Superior frontal convolution, a =- cutting off of the medullary radiations at the 

 adjoining tips of two convolutions. 



Fig. 274, x 7. Convolutions surrounding the central fissure at the extreme vertex of the hemisphere. 

 a = irregular demyelination of the superficial and invasion of the deep cortex. 



Fig. 275, x 7. Convolutions of the para-central lobule. « = area confined to the medullary radiations ; 

 /; = wedge-shaped area involving whole depth of the cortex and extending with truncated apex into the 

 transition zone of white matter. 



Fig. 276, x 6. Convolution of the island of Reil. a = irregular demyelination of the cortical radiations 

 and extension into the cups of the adjoining convolutions ; 6 = small area in the white matter at base of 

 the medullary ray. 



Plate LXIV. 



Figs. 277-288. Special features of cerebral areas, chiefly cortical. Kulschitsky-Pal with picro-fuchsin. 



Fig. 277, x 6. Convolution of the para-central lobule. Note the sharp delimitation of the area both 

 in the white matter and in the radiations of the cortex (cf. fig. 74 (a) ). 



Fig. 278, x 15. Convolution of the intra-parietal sulcus. Wedge-shaped area in the cortex extending 

 with truncated apex into the white matter. 



Fig. 279, x 13. Convolution of the marginal gyrus. Area surrounded by a zone of lighter staining 

 both in the white matter and cortex. 



Fig. 280, x 12. Convolution of the parieto-occipital fissure. 



Fig. 281, x 10. Superior parietal convolution. Involvement of the cup of a convolution. 



Fig. 282, x 7. Superior frontal convolution. Area extending from the medullary ray and sharply 

 cutting off the radiations. 



Fig. 283, x 5. Convolution of the para-central lobule. Two well-defined areas in the white matter 

 and one extending from medullary ray to surface of the convolution. 



Fig. 284, x 6. Convolution of the frontal operculum. Area cutting across the medullary ray and 

 involving cortex on either side (cf. fig. 25 (e) ). 



Fig. 285, x 5. Area in a parietal convolution involving several medullary rays with their radiations, 

 with the exception of the tip of one convolution (cf. fig. 95 (e) ). 



Fig. 286, x 28. Area at the lateral surface of a convolution — involving both transition zone and 

 radiations, and showing the very abundant capillary plexus of the cortex. 



Fig. 287, x 33. Small area situated within the radiations, with central longitudinal vessel. 



Fig. 288, x 13. Convolution of the central fissure — well-defined area in the medullary ray and 

 involving the transition zone (cf. fig. 74 (b) ). 



Plate LXV. 



Figs. 289-300. Special features of individual areas, chiefly cerebral. Kulschitsky-Pal with picro- 

 fuchsin. Fig. 291, Heidenhain's iron-hsematoxylin stain. 



Fig. 289, x 10. Area in the mesial line of upper pons — cutting across, in sharply-defined lines, the 

 intersecting fibres of the raphe and the adjoining fibres on each side. Cf. fig. 44 (a); also figs. 16, 17, and 

 421, which show the complete retention of the axis cylinders across this demyelinated area. 



Fig. 290, x 6. Showing a = involvement of the medullary cores of several cerebellar folia? ; b = areas in 

 the cerebellar white matter ; and c = in the peduncles. 



Fi". 291, x 10. Medulla oblongata at level of middle of inferior olive, showing faint staining of the 



