788 INDEX TO VOLUME XX 
Petrography of Tripyramid Mountain. By L. V. Pirsson. Review by ae 
A. W. Stickney : 4 ; : 3 478 
Petrological Abstracts and Reviews mL i 80, 270, 362, 469 
Petrology, Problems in. By Joseph P. iaehae. Review by Whitman 
Cross . d : g 3 : : é 362 
Petrology, Some sneer of Mgderne By Alfred Harker. Review by 
Whitman Cross s ; sy OP 
Physical Setting of the Ghilean Beriee Deposits The. oBy Rollin T. 
Chamberlin : 763 
Pirsson, L. V., Whitman Cees, J. P. liad H. S. Washington: 
Modifications of the Quantitative System of Classification of 
Igneous Rocks . TN MEUM el ean Ae ICI) 
Pirrson, L. V., and W. N. ice Geology of Tripyramid Mountain. 
Review by A. W. Stickney : : é ; : A Mas ney Re) 
Plastizitat der Mineralien und Gesteine, Ueber. By L. Milch. Review 
by E. Steidtmann 475 
Pogue, Joseph E. The Cid Meine! ictnice of Tayideon County, 
North Carolina. Review by A. D. B. 04 
Pre-Cambric Geology of Sweden and New York, Comparative Sketch 
of the. By James F. Kemp. Review by H.C. C. : 286 
Pressure, Influence of, on the Melting-Points of Certain Metals. By 
J. Johnston and L. H. Adams. Review by G. S. Rogers 272 
Prince William Sound, Alaska, Reconnaissance of the Geology aud 
Mineral Resources of. By U.S. Grant and D. F. Higgins. Review 
by A. E. F. 282 
Prosser, CharlesS. The Diccontarmnint Between abs Bedford aad Bered 
Formations in Central Ohio . 585 
Prouty, William F. Water-worn pebbles in (Carboniteren: Sandstone 769 
Quantitative System of Classification of Igneous Rocks, Modifications 
of the. By Whitman Cross, J. P. Iddings, L. V. Pirsson, and H. S. 
Washington 550 
Raritan Formation, The Flora of. By Edward W. Berry. Review by 
Fa\oad Died es : : 5 : 580 
Recent Publications ay mE ee re ne EBT nies i 380 
Reeds, Chester Albert. A Report on the Geological and Mineral 
Resources of the Arbuckle Mountains, Oklahoma. Review by 
AC Ear 287 
Report on the Astoria te Cost af a Canal Between Bay iElead andl me 
Shrewsbury River. By Henry B. Kiimmel. Review by A. E. F. 580 
REVIEWS 7 Sy ech a Re a 2) Pie! GOTT OARe 2 Sian 377 9™ ecOmOyiseur 72 
Rice, W. N., and L. V. Pirsson. Geology of Tripyramid Mountain. 
Review by A. W. Stickney 
478 
