INDEX TO VOLUME XXI 
Jennings, O. E. Note on the Geology of the Isle of Pines, Cuba . 
Jo Daviess County, Illinois, Some Partly Dissected Plains in. By 
Arthur C. Trowbridge 
Johannsen, Albert. An Accessory Den fon Opeervine Tae eine: 
Figures of Small Mineral Grains . 
Johnston, John, and Paul Niggli. The General Beneipies ederim 
Metamorphic Processes. Pt. I 
The General Principles Underlying Mefamorniie Bragesses 
Pt. EL 
Keyes, Charles R. Original Streams; and Their Réle in General 
Desert-Leveling 
Kindle, Edward M. The Dneaaaerhisy at tihe Pace of the Gnondaes 
Limestone in New York and Its Equivalent West of Buffalo, The. 
K6ézu, S. Preliminary Notes on Some Igneous Rocks of Japan 
Lake Superior—Lake Huron Region, The Significance of Recent Develop- 
ments in the Pre-Cambrian Stratigraphy of the. By Morley E. 
Wilson : 
Later Cenozoic History, The, a the Wind Niger Mountains) Wyodnae! 
By Lewis G. Westgate and E. B. Branson . : 
Leaching on Drift Pebbles, The Effect of. By J. A. Wadden : 
Leighton, Morris M. An Exposure Showing Post-Kansan Glacaton 
Near Iowa City, Iowa 
Lens, An Accessory, for Observing Interference Figures of Small Mineral 
Grains. By Albert Johannsen 
Lewis, J. Volney. Determinative mnneralonys Reey by A. D. B. 
Lindgren, W., and C. W. Hayes. Contributions to Economic Geology, 
toro. Pt. I. Metals and Non-Metals except Fuels. Review by . 
AD. B: : 
Log of Well of Benneyivania Salt Gomer Detroit, Michizane By 
William H. Fry : 
Loughlin, G. F. Reeoinaissance’’ in De Southern Wasatch Mouritains, 
Utah . 
Muzon, PE. The Gigs ie By Warten D. cmivhe Ph.D. 
Mandible in Amphibians and Reptiles, The Primitive Structure of the. 
“By S. W. Williston . , ; : ae: ciikiece oe 
Martin, Lawrence, and R. S. are Glacial Deposits of the Continental 
Type in Alaska 
Metamorphic Processes, The (General Bameples Undergane: ‘By John 
Johnston and Paul Niggli. Pt. I ; 
Metamorphic Processes, The General Bameiales jndedyane! tee ane 
Johnston and Paul Niggli. Pt. IL ere. ee 
793 
PAGE 
367 
731 
96 
481 
588 
268 
301 
