The American Geologist. 
December, 1905. 
Chamberlin, viii, 233, 267. 
Augen-Gneiss area at Bedford, 
New York, Luquer and Ries, 
xviii, 239. 
Aughey, Samuel, Geyserite in Ne- 
braska, (cit.), i, 277. 
Augite syenite near Loon lake, 
New York (abs.), H. P. Cush- 
ing, xxiii, 106, 330 (rev.). 
Augusta, Use of the term in ge- 
ology, C. R. Keyes, xxi, 229. 
Auriferous gravels of the Sierra 
Nevada. H. W. Turner, xv, 371. 
Australasia, Ancient glaciation in. 
C. H. Hitchcock, xxiii, 252; Mt. 
Lofty ranges, W. H. Howchin, 
(rev.), xxxv, 114. 
Australia, Evolution of, A. C. Greg- 
ory, (abs.), xvi, 114. 
Australian Tertiary mollusca, G. F. 
Harris, (rev.), xxi, 383. 
Australian Institute of Mining En- 
gineers, (p.s.n.), xii, 65. 
Autobiography of Jos. Le Conte, W. 
D. Armes, xxii, 396. 
Autodetus and some paramorphic 
shells of the Devonian, J. M. 
Clarke, xiii, 327. 
Avalanche of ice on the Gemmi 
Pass, xvii, 359. 
Average elevation of the United 
States, Gannett, (rev.), xv, 62. 
Aviculipecten, typical species and 
generic characters, G. H. Girty, 
xxxiii, 291, xxxiv, 332; W. Hind, 
xxxiv, 200. 
Avi -fauna of the Silver lake region, 
Oregon, Shufeldt, vii, 235. 
Award of geological medals at Lon- 
don, viii, 62. . 
Awards in the department of Mines 
and Metallurgy, St. Louis Pur- 
chase Exposition, xxxv, 62, 130. 
Auxology, Terms of, Buckman and 
Bather, xii, 43; (ed. com.), xil, 
257; A. Hyatt, xii, 290; (ed. com.), 
xii, 326. 
Azoic system and its subdivisions, 
P. Frazer, ii, 184; Definition of, 
(ed. com.), v, 106; 
Azoique terrain de Bretagne, fossils 
in, Barrois, (rev.), xi, 118. 
Aztecs, used meteoric iron, Hen- 
soldt, iv, 37; 
Babcock, E. G. (and F. A. Wilder), 
Geol. Sur. of North Dakota, sec- 
ond report, (rev.), xxxi, 383. 
Backbone of the continent, Wheeler, 
(p.s.n.), vii, 270. 
Backstrom, H., Causes of magmatic 
differentiation. (rev.) xiii, 194, 
Tvenne nyupptackta svenska klot- 
graniter, (rev)., xiv, 53; Vestana- 
faltet; En petrogenitisk studie, 
(rev.), xxi, 385. 
Backward step in paleobotany, G. 
F. Matthew, (rev.), xxlx, 251. 
Bacubirito meteorite of Mexico, 
H. A. Ward, xxx, 203; J. G. Agul- 
lera, (cit.), xxx, 111. 
Bagg, R. M., (p.s.n.), 131, 400; Oc- 
currence of Cretaceous fossils in 
the Eocene of Maryland, xxii, 370; 
Cretaceous foraminifera in New 
Jersey, (rev.), xxiii, 126; (.p.s.n. J, 
xxxii, 61; Earthquakes in Socorro, 
New Mexico, xxxiv, 162; Foram- 
inifera of the bluff at teanta Bar- 
bara, Cal., xxxv, 123. 
Bahamas, Expedition to, A. Agas- 
siz, (abs.), xiii, 141. 
Bailey, E. H. S., (cit.), v, 250; (p.s. 
n.), xv, 400. 
Bailey, G. E., (p.s.n.), iv, 254. 
Bailey, L. W., Explorations in New 
Brunswick, Quebec, and Maine, 
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the geology of Maine and New 
Brunswick, (rev.), vi, 390; Geol- 
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(p.s.n.), x, 6S; Progress of in- 
vestigations in southwestern Nova 
Scotia, (rev.), xiv, 67; (p.s.n.), 
xvi, 197; 
Bain, H. F., (p.s.n.), xii, 129; Pecul- 
iarities of the Mystic coal seam, 
xiii, 407; (.p.s.n.), xv, 335; Central 
Iowa section of the Mississippian 
series, xv, 317; (and J. E. Todd,) 
Interloessial till near Sioux City, 
(rev.), xvi, 61; Preglacial eleva- 
tion of Iowa, (rev.), xvi, 62; (p.s. 
n.), xviii, 5S, 26o; Glacial drift in 
central Iowa, (rev.), xx, 272; Geol- 
ogy of Polk county, (rev.), xx, 
334; Drift in southwestern Min- 
nesota and northwestern Iowa, 
(abs)., xxi, 136; Aftonian and pre- 
Kansan deposits of southwestern 
Iowa, xxi, 255; (and A. F. Leon- 
ard), Middle coal measures of 
the western interior coal held, 
(abs.), xxiii, 251; Interglacial de- 
posits in Iowa, xxii, 326; Notes 
on the drift of northwestern Iowa, 
xxiii, 168; (p.s.n.), xxiv, 66; (p.s. 
n.), xxvi, 63; Western interior 
coal field, (rev.), xxx, 124; (p.s. 
n.), xxx, 71; (p.s.n.), xxxi, 128, 
394; (p.s.n.), xxxiii, 63, 202, 332; 
(p.s.n.), xxxvi, 134; 
Baker, James, Annual report, mines 
of British Columbia, (rev.), xvll, 
395. 
Baker, Marcus, ^p.s.n.), xxi, 332; 
(p.s.n.), xxii, 129; (obit.), xxxiii, 
61. 
Balanus proteus, J. A. Cushman, 
xxxiv, 293. 
Baldwin, Judge C. C., (cit.), Opin- 
ion of Charles Whittlesey, iv, 267. 
Bald mountain, New York, Struc- 
ture, according to Emmons, vii, 
16. 
Baldwin, S. Prentiss, Recent 
changes in Mulr glacier, xi, 366; 
Pleistocene history of the Cham- 
plain valley, xiii, 170. 
Baldwin, W. J., (p.s.n.), vlll, 404. 
Ball, — , The cause of an ice age, 
(rev)., xl, 202. 
Ball, R. S., Wanderings of the north 
pole, (rev.), xil, 192. 
Ball, Valentine, (obit.), xvi, 203. 
Bather, A., Remarks on Golliez 
section in the geological hand- 
book of Switzerland, xv, 62. 
Bandai arc of Japan, Hobbs, xxxiv, 
2S5, 291. 
Banded structure of some Tertiary 
