Jeffries Wyman. 171 
The following, then, are the general changes in the verte- 
brate eye, as we go'up the scale: 1. A gradual change of the 
position of the eyes from the s/des to the front of the head, and a 
consequent change of the angle of inclination of the optic axes 
rom 180° to parallelism. 2. A gradually — gradua- 
tion of the fineness of oe Ae 8 and therefore the sensi- 
tiveness of the retina, from the anterior margins toward the cen- 
tral parts, so as finally to form in monkeys and in man a cen- 
tral spot. 3. A ses increasing power of converging the 
optic axes upon a single near point, so that the images of that 
point may fall upon the central spots of both eyes. 4. The 
gradual evolution of the properties of corresponding points, 
and ——- of all the distinctive phenomena of binocular 
visio 
Thos se changes seem all intimately connected with each other 
and with the development of the higher faculties of the mind. 
Oakland, Cal., Oct. 26, 1874. 
Art. XIX.—Jeffries Wyman. Address of Professor A. GRAY 
at the Memorial Meeting of the Boston Society of Natural 
History, Oct. 7, 1874. 
[Concluded from page 93.] 
In ccm ote. these analyses, I am drifting into a ay which 
Prof. Wyman never committed, that of being too I 
must leave uke of his papers unmentioned, and eat refer 
to two or three others which cannot be passed over. The most 
noteworthy of the shorter papers, however, are upon less tech- 
nical or more oe Se topics, so that we have need 
only to be reminded of them. Among them are his ‘‘ Observa- 
tions on the Dewslopaens of the Surinam Toad,” and the same 
of “ Anableps — and the paper “On some unusual 
Modes of Gesta The importance of these bi hes 
* From the “ Proceedings” of the se 
