INDEX TO VOL. XXVII. 
Action of Ammonium Chloride on 
Xatrolite etc., F. W. Clark and 
G. Steiger, 40. 
Action of Ammonium Chloride on 
Anaicite and Leucite, F. M. Clark 
and G. Stelger, 184. 
Adams, F. D. (and J. F. Nicholson), 
An experimental investigation into 
the flow of marble, 31G. 
Allen, Thomas W., 327. 
Ami, H. M., A national museum for 
Canada, 259 ; Brief biographical 
sketch of Elkanah Billings, 22."). 
American Association for the Ad- 
vancement of Science, 387. 
American Museum of Natural His- 
tory, 389. 
Anaconda Copper Mining Company, 
197. 
Analvsis of smithsonite from Arkan- 
sas, W. W. Miller, Jr., 315. 
Analvsis of emerv from Virginia, W. 
W. Miller, .Tr., 314. 
Analysis of Italian volcanic rocks, 
H. S. Washington. 182. 
Anderson, F. M., 131. 
Andrews, K. C, Notes on the lime- 
stones and general geology of the 
Fiji islands, 256. 
A new meteorite from Oakley, Logan 
county, Kansas, II. L. Preston. 50. 
Analysis of rocks. Laboratory of the 
United States Geological Survey, 
F. W. Clark, 316. 
A record of the geology of Texas for 
the decade ending Dec. 31, 1896, 
F. W. Simonds. 57. 
A remarkable marl lake, C. A. Davis, 
188. 
Are the amygdaloidal melaphyrs of 
the Boston basin intrusive or con- 
temporaneous. W. O. Crosby. 323. 
Are the St. .Tohn plant beds Carbon- 
iferous? G. F. Matthew, 383. 
A single occurrence of glaciation in 
Siberia. C. W. I'urington. 45. 
A text-book of important minerals 
and rocks, S. E. Tillman. 48. 
Barrett. K. L.. The Sundal drainage 
svstem in Central Norway, 123. 
Barton, Geo. H.. 327. 
Beede. J. W.. 387. 
Bertiage zur Burtheiling der Brachi- 
opoden, 183. 
Beitrage zur Burtheiling der Brachi- 
opoden, 183. 
Beitrage zur Kenntniss des Siberis- 
chen Cambrium. E. von Toll, 54. 
Bell. Robert, 263. 
Bement, Collection of minerals, 63, 
328. 
Billings memorial portrait. 198. 
Bishop, S. E., Brevity of Tuff-cone 
eruption, 1. 
Blake, W. P. 130 : Some salient fea- 
tures in the geology of Arizona, 
with evidences of shallow seas in 
Paleozoic time, 169. 
Bownocker, J. A., 327. 
Branner, J. C, Geology in its rela- 
tions to Topography, 257. 
Brevity of Tuff-cone truption, S. E. 
Bishop. 1. 
Brief biographical sketch of Elkanah 
Billings. H. M. Ami, 225. 
Brief review of the titaniferous mag- 
netites. J. F. Kemp, 119, 
Brooks, A. II., 64. 
Brooks, T. B., Obituary notice, 263. 
Buchan. J. S., AVas mount Koyal an 
active volcano? 313. 
Bulletin of the Iladley laboratory of 
the University of New Mexico, C. 
L. Herrick. 58. 
Bumpus. H. C, 64. 
Burr. H. T.. Structural relations of 
the melaphvrs of the Boston basin, 
319. 
Calcareous concretions of Kettle 
point, U. A. Daly. 253. 
Calvin, S.. 327 ; Concerning the oc- 
currence of gold and some other 
mineral products in Iowa. 363. 
Cambro-Silurian limonite ores of 
Pennsylvania, T. C. Hopkins. 50. 
Carnotite and associated vanadifer- 
ous minerals in western Colorado. 
W. F. Hillebrand and F. L. Ran- 
some. 183. 
Cerrillos anthracite mines, 264. 
Chemical composition of sulpho- 
halite. S. L. Pcnfield. 50. 
Chemical fomnosition of turquois. S. 
L. Pen field. "50. 
Chemical studv of the Glaucophane 
schists, II. S. Washington, 184. 
Clark. C. W.. 197. 
Clark. F. W. (and G. Steiger). The 
action of ammonium chloride on 
natrolite. etc.. 49. 
Clark. F. W.. Analyses of rocks. I'. 
S. geolftpical survev, 316. 
Clark. F. W. Oind G. StelgerK Ac- 
tion of ammonium chloride on 
anaicite and leucite. 184. 
Classification of igneoirs rocks, W. 
II. Ilobbs. 52. 
Claypole. E. W.. 130; Notes on 
petroleum in California. 15(t. 
Coal mining in Pennsylvania. 300. 
