428 SAMUEL C. PALMER 
TABLE 13 
Total numbers of Miiller’s fibers in retinas of minimum, maximum, and average sizes 
BAe LA Zz 6 ] Nl fe es 
2 Gina | as | | OF 
2 $ < < 
Haz a a ep g @ 
aoHSE a aS ia o & 
BOO 49 Ae 2 aa 
i Sigil = eI De | 5 & aE 
RELATIVE SIZE OF antgka Bie ele | ZS 3) 
EYEBALLS lg St ma Z of47 | a 22 
B<dHa 3 Pa A | Ay pm 
a7 5H 1 mR | ona yA 
HAAS i < Bag | “gx Cie S| 
paeras Oop aha tm re] 
omar aaH ao Seq | aoe <:p 
Zea aOM ND Sib | Sa < Bos 
N 3} 
iS) n a | < a 
Minimum........ 8.6916 0.089 | 222.861 97.5 21,729 
Maximum...... 13.0690 OF 039) 9) 2335. 102 97.5 32,672 
| 
Averages of 14 | 
GEUIVAS ae ares 10.7910 0.039 276.723 9125 26,980 
sists in its usual form of three layers of nuclei (fig. 1), of which 
the middle one has fewer nuclei than either of the other two. 
In addition a large part of the nuclei of Miiller’s fibers lie within 
it (figs. 1 to 3). The number of layers may be as numerous as 
four (fig. 3), or even five, or they may be as few as two (fig. 2); 
in one case I found only a single layer in a part of one side of 
the retina. Such variation makes any estimate of the number 
of cells unsatisfactory. Since the most frequent condition is 
the three layered one, I have determined the number of nuclei 
in a zone of this kind. Figs.1 to 4 show that there is little differ- 
ence in the ‘tangential’ diameters of the nuclei of the outer and 
inner nuclear layers. With any increase or decrease in the aver- 
age tangential diameter of the nuclei of one of these layers over 
that in the other, the number of nuclei in a given belt, such as 
I have used in the inner nuclear layer, would be found to vary 
and I could not then make the proportion as stated, but if the 
average tangential diameters of the nuclei of the two layers is 
the same the relations between the two would be constant and my 
results would hold true. Since this is the case, the total number 
of nuclei in the two layers respectively should be nearly propor- 
tional to the number of rows as seen in radial section, and the 
area of the zone. If, then, the number of nuclei in the outer 
nuclear layer is 121,000 and this number varies as the number 
of rows and the area of the zone, it varies as their product, and 
the number of nuclei in the typical inner nuclear layer in the ret- 
