312 



S. Simpson, 



exaggerated on the right side, but in one case it was absent. In the 

 cases in which observations were made, the temperature of the paral- 

 ysed limbs was from -5" — 1° J. lower than that of the opposite side 



at first, but in one case it was higher. In 

 four cases there was right homonymous 

 hemianopsia. In two of these, this had 

 disappeared within a week, but in Cats IV 

 and VII it lasted as long as the animals 

 were allowed to live, — 17 and 23 days 

 after the operation respectively. In neither 

 of these cases did the lesion involve the 

 basal ganglia. A photograph of the brain 

 of Cat IV shows the area of cortex to 

 which the dura mater was adherent and 

 the extension of the lesion backwards 

 into the corona radiata (see fig. 2). 



Secondary Degeneration. In only two cases — Cat III and 

 Cat VI — was any part of the brain in front of the mesencephalon 



Fig. 2 a. 



Brain of cat (natural size) to 



show naked eye appearances. 



Left front surface view. 



Lesion Tip of antei'ior iiorn of lateral voitricle 



Fig. 2b. Fig. 2c. 



Brain of cat (natural size) to show naked eye appearances. 2b) After anterior jiart 



of left cerebral hemisphere has been .sliced away. 2c) After a second slice has 



been reriioved — the le.sion does not extend to the plane of tliis section. 



prepared by tlie Maichi method. In Cat III coronal sections tln-ougli 

 tlie thalamencephalon show degenerated fibres scattered ovei- about 

 the middle "/r/** of tlie internal capsule on the h'ft side; from this 

 area a few degenerated fibres can be seen passing into the ()[)tic tha- 

 lamus, and these latter are most abundant in the sections taken most 



