Index, Volumes I-XXXVL 
103 
378; (and Etheridge,) Mesozoic 
insects of New South Wales, 
(rev.), viii, 327. 
Om Didymograptus. Tetragrapus 
och Phvllograptus. G. Holm, 
(rev.), xvi, 58. 329; Olandska 
Ranker. J. G. Sanderson, (rev.), 
xvii, 55, 
On a chemical origin of the iron 
ores of the Keewatin. N. H. 
Winohell, and H. V. Y\ inchell. 
Iv, 291; Burrows and tracks of 
invertebrate animals. J. W. 
Dawson, (rev.). vii, 55; the 
genus ampyx. A. W. Vogdes, xi, 
99; Conditions favorable for 
glaciation, G. F. Becker, (rev.), 
xiv, 191; a new triolobite from 
Arkansas, A. W. Vogdes. (rev.), 
xvi, 2ii2; some dikes containing 
Huronite, A. E. Barlow. (rev.), 
xvi, 119; some dikes in the vicin- 
ity of Johns' Bay, Maine. F. 
Bascom, xxiii, 275; Hydromica 
from N. J., Clark and Darton, 
(rev.), xxiv, 182: Slate frag- 
ments southwest Patagonia. E. 
Nordenskjold, xxiv, 3S8; Argilla- 
ceous rocks with quartz veins, 
O. A. Derby, (rev.), xxiv, 182; 
Composition of Parisite, Pen- 
field, and Warren, (rev.), xxiv, 
318; Nomenclature of American 
fossil vertebrates, O. P. Hay, 
xxiv, 345; Occurrence, origin and 
composition of chromite, (rev.), 
J. H. Pratt, xxiv, 181; Occur- 
rence of Paleotrochis in volcanic 
rock in Mexico. H. S. Williams, 
(rev.), xxiv, 181; Phenoerysts of 
isrneous rocks. L. V. Pirsson. 
(rev.), xxiv, ISO; Separation of 
alumina from molten magmas. J. 
H. Pratt, (rev.), xxiv, 319; Stra- 
tification planes, C. R. 
Keyes. xxiv, 294; pores in the 
ventral sac in Fistulate Crinoids, 
F. Springer, xxvi, 133; sun- 
newly discovered nepheline syen- 
ite areas, W. G. Miller, xxvli, 
21; Age of certain granites in 
the Klamath mountains. O.- H. 
Hershey, (abs.), xxvii, 258; Con- 
stitution of Barytocelestite, C. 
W. Volney, (rev.), xxvii, 315; 
Helderberg fossils near Mont- 
real, Petrography of Shefford 
mountains, J. A. Dresser, 
xxviii, 203; Bacubirito of Sina- 
loa, Mexico, H. A. Ward, xxx, 
203; Sagenocrinus, Forbesiocrin- 
US and allied forms. F. Springer, 
xxx, 88; Deci ssilizs tion 
of certain species, F. W. Sarde- 
son. xxx, 39; Fossils from For- 
mosa and Kin-kin. Newton and 
Holland, (rev.), xxx, 122: Juras- 
sic fossils from Durango. Mexi- 
co. D. W. Johnson, xxx. 370. 
the Lansing man. S. Williston, 
xxxv, 342. 
Oneota sandstone, James Hall, 
(p.s.n.), x, 194. 
Ontario. ECoi iii geology of, K. 
Bell, (rev.), v, 238; Natural gas 
and petroleum. H. P. Brumell, 
'vow), xii, 120; Second report ot 
the bureau of mines. A. Blue 
(rev.), xii, 260; Nepheline sodal- 
ite in Dunganon, B. J. Harring- 
ton, (abs.), xiv, 68; Nepheline 
syenite in Dunganon. F. D. 
Adams, (rev.), xiv, 1S9; Deep 
well at Deloraine, A. R. C. 
Selwyn. (rev.), xvi, 197; Bureau 
of mines. 4th report, 1894; Archi- 
bald Blue, (rev.), xvi, 313; coast 
between Fairhave and Sodus 
bays, J. O. Martin, xxvii, 331; 
Oolite, formation of, A. Roth- 
pletz x. 279; microscopic struc- 
ture ' of, E. O. Hovey, (abs.), 
xiii. 
Ophiolite, Thurman, N. Y., G. P. 
Merrill, iii, 268. 
Ophir loop, Diorite of. W. Cross, 
tabs.), xvii, 345. 
Opinions concerning the age or 
the Sioux quartzite, C. R. 
Keves, (rev.), xvi, 319. 
Optical and chemical properties 
,,f the Amphiboles, A. C. Lane, 
(rei >, xiv, 195. 
Optical characters of Jacksonite, 
N H. Winchell. xxiii, 2o0. 
Orange sand. Lagrange and Ap- 
pomattox. Hilgard and Safford, 
viii, 129; Ditto, R. D. Salisbury, 
Orbicular' granite from Rhode Is- 
land J. F. Kemp, (rev.), xiv, 53, 
from' Sweden, H. Backstrom, 
(rev) xiv, 53: Gabbro of Dehe- 
sa. Kessler and Hamilton, xxxiv, 
133 
Orcutt C. R., Occurrence of tourm- 
alines In California, (abs.), xxn, 
Ordonez. E., gold of Mexico, (rev .), 
xx ;i 124- emotive rocks of the 
Cue'nca of Mexico, (rev.), xvih, 
17; (cit.), xx. 185. 
Ordcvician, (Am. com.), n, -ll. on 
thf -Atlantic coast. G. F. Matthew 
xviii 15; in the I ake Chainpiain 
valleys, T. o. Wnlte, (abs.), xxm, 
96; Meteorology* of. F. w - 
Sarde'son, xxvi. 388: Variations 
in thickness of subdivisions. A. 
F. Foerste, xxxiv, 87. 
Ore deposits of Colorado, A. Lakes, 
(rev ) xii, 261; Of the 1 nited 
States*. J. F. Kemp. (rev.), xt., 
268- Deposits of the Lnited 
States .1. F. Kemp, (rev.), xv, 
57- Deposits of Monte Cristo, 
Washington, (ed com.), xxx, 113; 
Formation through surface de- 
composition, C. R. Keyes. Xxvll, 
Ores of the noble and useful met- 
nls lot the Columbian exposi- 
tion, (ed. com.), xiii, 48. 
Oregon. Early Cretaceous of, G. 
F. Becker, (rev.), vii, 258; ' !re- 
t aC i ous a nd early Tertiary, J. S. 
Dlller, (rev.), xii, 119; New spe- 
cies of Temnoryon, John Eyer- 
m.iii. xiv, 320; Fossils from the 
Miocene, J. Eyerman, xvii. 267; 
Crater lake special map. J. S. 
Diller, (p.s.n.). xviii. 59; Cre- 
taceous of the Pacific coast; Re- 
latlons with the Eoceni T W 
