THOMAS c CHAMBERLIN AND ROLLIN: D. SALISBURY 
. With ‘the Active Collaboration. of. 2 f Siang ss my 
ae Ww. Seitienow Vertebrate Paleontology ; ALBERT JOHANNSEN, Petrology Pn ie 
T WELLER, Invertebrate Paleontology - ROLLIN Te CHAMBERLIN, DuneaDe Geology 
oe ALBERT D. Ep Economic Geology a, 
ASSOCIATE EDITORS 
HIBALD GEIKIE, ha Britain Roane ; JOSEPH P. IDDIN GS, Ween D. c. id 
S BARROIS, ‘France 9 : JOHN C. BRANNER, Leland Stanford Junior Gaiecivy. 
al PENCK, Germany wed Sten) i RICHARD A. F. PENROSE, Jr, a Philadelphia, Pa. 
WILLIAM H. HOBBS, University of Michigan 
FRANK D. ADAMS, McGill University 
; CHARLES K. LEITH, University of Wisconsin © 
GROVE we GILBERT, Washington, D.C. _ WALLACE W. ATWOOD, Harvard University 
CHARLES D. WALCOTT, Smithsonian Institution : WILLIAM H. EMMONS, University of Minnesota 
NEY. WILLIAMS, Cornell University ARTHUR L. DAY, Carnegie Institution 
ane -- SEPTEMBER-OCTOBER 1918 
TWO- PHASE CONVECTION IN IGNEOUS MAGMAS - - - - FRANK F. Grout 481 
ee CARBONIFEROUS CONDITIONS VERSUS PERMO- CARBONIFEROUS TIME 
i He CACASE 500 
NOTES ON THE ‘GEOLOGY OF EASTERN GUATEMALA AND NORTHWESTERN 
% SPANISH HONDURAS: © 2° Sonije" 2 a as Ph SIMNEY) POWERS” 507 : 
NOTES ON A COLLECTION OF ROCKS FROM HONDURAS, CENTRAL AMERICA 
Witpur G. FovE 524 
_ LOESS-DEPOSITING WINDS PIN LOUISEMNA Kj or 6 OS ee F. V. EMERSON 532 
* VOLUME CHANGES IN METAMORPHISM =~ (= = = > Warpemar LinpcRen © §42 
s DESCRIPTIONS OF SOME NEW SPECIES OF DEVONIAN FOSSILS 
w CiInton R. STAUFFER 555 
ON THE NATURE AND ORIGIN OF THE STYLOLITIC STRUCTURE IN TENNESSEE 
BU RSENS Hs ae in ee ee A pt open a Se SS C. H. Gorpon 561 
Pte, VALLEY CIFM GRABEN, UTAH = 0-00 5) 20h Se CL. Dake 4569 
Bee SB EMER ee Ne ie caine: aimee Ne aban wie he ae ioe al seca RY tel, | ie as Gthe 
: RECENT: PUBLICATIONS © = te). (55 04)- + peas = a eB Sia dss = 25 570 
TIE UMIVERSITY OF CHICAGO PRESS 
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