Oldal 181 [181]
INDEX II 5
perspective of, 56; slightly in- | " Value” of water, 75.
clined, 43. Vertical lines of image, persist¬
. Sunset colours in rippled water, ence of in rippled water, 44, 50,
90, 105. 52.
Sun-streak, 37; disappearance of | Vision, angle of, 65, 71, 75, note,
of, 38, 98. 81, QI.
Swiss lakes, 69, 82, 85, 87, 94,
107. Young-Helmholtz theory of col¬
our perception, ror.
Threlfall, Prof. R., 84, 109.