424 SAMUEL C. PALMER 
external row there was an average of 422 nuclei, as compared 
with 121.1 in the internal row. . Since the nuclei of the two layers 
have the same average diameters in the plane tangential to the 
surface of the eyeball, the ratio of the number of nuclei in the 
external layer to the number in the internal layer is 422 : 121. 
The total number of nuclei in each of these layers as well as in 
the whole outer nuclear layer is given in table 9. By comparing 
tables 7 and 9, the number of nuclei in the outer nuclear layer is 
seen to exceed the number of visual cells by about 10 per cent; or, if 
directly compared for total numbers of elements, there are 121,000 
nuclei in the outer nuclear layer to 111,000 visual cells. 
c. Ganglionic layer. The nuclei of the ganglionic layer, which 
in radial sections of the eye (figs. 1 to 4), are seen to be a single 
TABLE 8 
Number of nuclei of the outer nuclear layer per unit area of 0.0078 sq. mm. 
I ALL IN WHICH E FIELDS WERE ED 
SEAT OE REGIONS OF THE EYEBALL IN WHICH THE F WERE LOCAT 
THE EYEBALLS SSS SS = = SS ee 
Anterior | Posterior Dorsal Ventral | Fundus 
71 | | | 55.5 
| | 
| 
Sl | 54 
167 5350) 0) | 
21 ip A | | 
211 | 59 | | 
22,1 60 60 | | | 
83 r | | |» 49 
23 1 | |. S55 oa 
24 r | | | 47 
24 | | | 43 
25 r 42 | 60 | 
25 1 | 56it 
26 7 58.5 59 
28 r 53 | fame 
3lr | | 57 
32 r 60.5 | 5 
38 r 49 | | 
39 1 71.5 
40 r 56 
40 1 | 62 
or 
Averages of 5 
retinas Dane 58.9 57.9 bay 7 49.7 
*r, right eye; 1, left eye. 
