496 INDEX. 
White, I. C., terraces of western Penn-| Wright, G. F., glaciated area of Ohio, 4 
sylvania, 327, southern limit of the glacier, ag 
Whitfield, R. P, Utica slate graptolites, 
Widersheim, Ris ee ee der verglei- : 
- chenden Anatomie Y 
bse age: nh — mean of the Toons, ‘ G., corundum gems in India, 
ne ee ee Young, C. A., spectroscopic notes, 333. 
Wood, S.V., cause of the GYacial period, 
Wik 0. P., vapor densities Z 
Worthen: A, Illinois Geological 1 Re- 
port, 414, 4 
Zones, dry, Guyot, 161. 
ERRATA, 
e Fege 171, line 4 from bottom, add at the end of the sentence, except the violin 
famil 
Bese 179, line 1 from top, for 2Vh, read 2V,,. 
ge ic. — (3), all the coefficients shoul be 2. Equation (14), all the 
sigs eee 
Page 9 : 17 ae etic: for These ae read ee familiar. Line 8 
from bottom, after i insert a comma, and dele 
Page 185, line 14 from top, after velocity ig of t the tip "of the prong. 
3, 
Page te Figure 5 represe nis a crystal ‘of allanite, and — inserted by mistake. 
Page 279, line 18 f top, pyramids, read fragmen 
Page , line 4 from top, before i bts dele t 
Page 290, line 17 from bot omposition, “read deposition, 
Page 306, line 12 from bottom, insert vol. xxiii at the beginning of the line. 
Page 307, line 11 from bottom, tie — read locus 
