INDEX TO VOLUME XX 
Chamberlin, Rollin T. The Physical Setting of the Chilean Borate 
Deposits : . 
Cid Mining District of Berideort Gounty: North Cust, The. By 
Joseph E. Pogue. Review by A. D. B. : 
Clarke, F. W. The Data of Geochemistry. Review ie A. D. B. 
Clarke, John M. Observe on the Magdalen Islands. Review by 
ACE B a: ‘teenies 
Clough .€..; and: others. The Geology of ‘East Lothian: 2d ed. 
Review bac. eee Oioauaarien CS ene . ; 
Clough, C. T., and others. The ae of the Glasgow District. 
Review ee A. E. F. Fate ges 1" Sa uaa ree 
Clough, Craig, Wright, Bailey, and Flett. The Geology of Colonsay 
and Oronsay, with Part of the Ross of Mull. Review by Albert 
Johannsen 
Coal Which Bears leuideniee of Umisual Conditions! Accompanying Thee 
Deposition, An Occurrence of. By Jesse E. Hyde 
Cole, G. A. J. Rocks and Their Origin. Review by W. H. H. i 
Condit, D. Dale. The Petrographic Character of Ohio Sands with 
Relation to Their Origin De ed Wee he Cone ia ste haa 
Copper Handbook, Vol. X, The. By Horace J. Stevens. Review by 
eX 1D), 1835 elude tie) ieee a a 
Correction, A (of paper by 1D T. Dumble). “By F. M. Anderson 
Cortlandt Series and Its Emery Deposits, The Geology of the. By 
G. S. Rogers. Author’s Abstract LD REP aes ane, cor ae 
Cotton, C. A., P. Marshall, and R. Speight. The Younger Rock-Series 
of New Zealand. Review by A. E. F. Use i ck MeN sees gia 
Craig, Wright, Bailey, Clough, and Flett. The Geology of Colonsay 
and Oronsay, with Part of the Ross of Mull. Review by Albert 
Johannsen 
Crosby, W. O. Dymamee ReHons and T Ean ology) i Sua eeaphie 
Conformity and Unconformity 
Cross, Whitman. The Natural Glassaerion of Teneous Rocks. 
Author’s Abstract : 
Reviews of The Fundamental Problems of Potroreness: or 
the Origin of Igneous Rocks, by Franz Loewinson-Lessing; Some 
Aspects of Modern Petrology, by Alfred Harker; Problems in 
Petrology, by Joseph P. Iddings; The Natural Classification of 
Igneous Rocks, by Whitman Cross 
Use of Symbols in Expressing the Memutatve Glassiicarion 
of Igneous Rocks 
Cross, Whitman, J. P. Iddings, i V. Barecon! H. S. Wachimetont 
Modifications of the Quantitative System of Classification of 
Igneous Rocks . 5 : : ; 
Crystallization in Igneous BOERS “The Onder fh By N. L. Bowen 
719 
PAGE 
763 
04 
680 
581 
579 
579 
80 
316 
679 
152 
283 
680 
278 
583 
80 
289 
362 
362 
758 
55° 
457 
