49 
In 1825, 120. 
In 1846, -101. 
Tin 166, HOO, = — 010. 
Difference — °019. 
IV. Focal length of the right or stigmatic eye, measured 
from the front of the cornea. 
In 1846, 4°7 inches; Reciprocal °213. 
Diff — 081. 
lin We Dei soos ue a 189. ifference 3 
The following conclusions appear to be supported by the 
examination of these numbers. 
1. The change in both focal elements of the left eye is far 
greater between early manhood and full manhood than between 
full manhood and approaching age; and the change in the 
astigmatic power is decidedly greater between early manhood 
and full manhood than between full manhood and approaching 
age. | 
2. The most constant of the elements is the astigmatism. 
3. Through the period 1846—1866, the distance for the 
left eye corresponding to the appearance of a nearly horizontal 
line is sensibly the same as the focal length of the right eye. 
G. B. AIRY. 
Roya OBSERVATORY, GREENWICH, 
1866, November 109. 
On some points in the Anatomy of the Chimpanzee, and 
the consideration of the term ‘Quadrumanous,’ as 
applied to that animal. By Prorsssor Humpury, 
ERS. 
Hits remarks were the results of the recent dissection of two 
Chimpanzees, and referred chiefly to the differences between 
their lower limbs and those of Man. He pointed out that the 
