Colors, primary versus secondary. 90 Drowsiness, double images seen in. 287
Brewster's view of.

analogues of, in other senses. 111
experiments illustrating.. 108-111

E

90

Elongation of the figures of phan-
tom plane....

89 Empiristic theory

3

237

40, 41

121

3

2

69

29

303

303

306

122

of the invertebrate eye..
of the vertebrate eye.
Experience, inherited..
Experiments illustrating the com-
bination of images of dissimilar
objects

125-129
illustrating the combination of
images of similar objects.... 129-133
illustrating the combination
of images of many similar ob-
jects regularly arranged.... 133-136
Eye, adjustment for light

adjustment for distance...
adjustment of the

31

35

44

an optical instrument..... 24, 138
axis of .....

defects of the, as an instru-

menting on....

199

rotation on optic axis in..... 201-208

ment.......

11

40

303

9

12

10

9

phenomena, application of

new mode of representation to.. 273 Volkmann..
Stevens, Prof. Le Conte........... 240

Ꮓ

2 Zonule of Zinn..

Superposition of external images. 124
System, nutritive......

humor..

13, 17, 52, 305

199

13

THE END.