62 Edward F. M alone. 



PLATE XI. 

 Homo. Series AC. Ganglion Optkum Basale. 



Fig. 37 shows the actual appearance of a portion of the basal optic gang- 

 lion in the preparation from which Fig. 9 (Plate III) was drawn. As in the 

 case of Fig. 36 the preparation was projected (but at a magnification of 

 145 diameters instead of S3%) and every cell outlined in pencil. Then 

 under the microscope every cell (except in rare instances where this was 

 impossible) was identified and reproduced accurately in water color. 



Magnification (after % reduction) = 96% diameters. 



Fig. 37 represents the whole breadth of the basal optic ganglion near its 

 medial pole (Fig. 9, PI. Ill), and shows the relation of this nucleus to the 

 substantia grisea of the third ventricle. To the right is seen the ventro- 

 lateral surface of the brain (anterior perforated substance). 



The large deeply staining cells are those of the basal optic ganglion. 

 Note that it is sharply separated from the substantia grisea. The long 

 coarse processes of the cells of the basal optic ganglion are here represented 

 as blue, but in reality they are almost colorless; this figure, however, repre- 

 sents correctly the peculiar appearance of an intercellular feltwork, to 

 which these processes give rise. 



The small pale cells are those of the substantia grisea ventriculi tertii. 

 Note the difference in appearance of the intercellular substance from that 

 within the basal optic ganglion, due to the absence of coarse cell processes. 



As in Fig. 36 bloodvessels and neuroglia have not been drawn. 



See PI. XII for the appearance of these two cell types (in man) under 

 higher magnification. 



