60 Edward F. M alone. 



PLATE X. 

 Homo. SsatLES AC. Nuclei Tubesis Laterales. 



Fig. 36 represents the actual appearance of a portion of the preparation 

 from which Fig. 4 (PI. I) was drawn. The preparation was projected at 

 a magnification of 83% diameters and every cell outlined in pencil. Then 

 under the microscope each cell (as far as this was possible) was identified 

 and reproduced in water color exactly as it appeared. This Illustration 

 is accordingly an accurate reproduction of the appearance of the preparation 

 except that bloodvessels and neuroglia have been omitted. 



Magnification (after y^ reduction) = 55% diameters. 



Comparing Fig. 36 with Figs. 4 and 4A it is evident that the region illus- 

 trated is the ventro-lateral portion of the tuber cinereum. At the right 

 upper corner is seen a portion of the pes pedunculi, while at the left upper 

 corner appears a portion of the fornix column. 



The two groups of small pigmented cells are the nuclei tuberis laterales. 

 Note that they are partly circumscribed by a zone containing few cells. 



The large cells are those of the nucleus tubero-mammillaris (nucleus 

 mammillo-intundibularis ) . 



The small pale blue cells are those of the substantia grisea ventrlculi 

 tertii. Note transition types between these cells and the large cells of the 

 nucleus tubero-mammillaris; this transition involves both the size of the 

 cells and the intensity of the stain, so that some cells occur which could not 

 be positively assigned to either of these two cell groups. 



Compare the various cell groups of Fig. 36 with the corresponding cell 

 types of PI. XII, where the cells (man) are highly magnified. 



