CONTENTS 
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PAGE 
Extinguished and Resurgent Coral Reefs By W. M. Davis 466 
The Origin of Certain Fiji Atolls ByW.M. Davis 471 
The Geologic R6le of Phosphorus By Eliot Blackwelder 490 
Dominantly Fluviatile Origin Under Seasonal Rainfall of the Old Red Sand- 
stone By Joseph Barrett 496 
The Influence of Silurian-Devonian Climates on the Rise of Air-Breath- 
ing Vertebrates By Joseph Barrett 499 
Sphenacodon Marsh^ a Permocarboniferous Theromorph Reptile from New 
Mexico By Samuel W. Williston 650 
The Origin of Veins of the Asbestiform Minerals By Stephen Taber 659 
A New Test of the Subsidence Theory of Coral Reefs. . . .By Reginald A. Daly 664 
On Some Anomalies in Geographic Distribution of Pacific Coast Mollusca 
By William Healey Datt 700 
The Earliest Fresh -Water Arthropods By Charles Schuchert 726 
MINERALOGY AND PETROLOGY 
Some Minerals from the Fluorite-Barite Vein Near Wagon Wheel Gap, Colo- 
rado By Esper S. Larsen and Roger C. Wells 360 
The Petrology of Some South Pacific Islands and its Significance 
By Joseph P. Iddings 413 
A Contribution to the Petrography of Japan. .By J. P. Iddings and E. W. Morley 452 
A Contribution to the Petrography of the Philippine Islands 
By J. P. Iddings and E. W. Morley 531 
BOTANY 
PAGE 
The Archegonium and Sporophyte of Treubia Insignis Goeble 
By Douglas Houghton Campbell 30 
Recent Explorations in the Cactus Deserts of South America . . . .By J. N. Rose 73 
The Nature of Mechanical Stimulation W.J. V. Osterhout 237 
The Marine Algae of the Pacific By W. G. Farlow 424 
Some Problems of the Pacific Floras By Douglas H. Campbell 434 
The Excretion of Acids by Roots By A. R. Haas 561 
New Determinations of Permeability By S. C. Brooks 569 
The Oaks of America By William Trelease 626 
Physiological Studies on Rhizophora By Howard H. M. Bowman 685 
ZOOLOGY 
PAGE 
On the Effects of Feeding Pitxhtary Body (Anterior Lobe) Substance, and 
Corpus Luteum Substance to Growing Chicks By Raymond Pearl 50 
Effects of Centrifugal Force on the Polarity of the Eggs of Crepidula 
By Edwin G. Conklin 87 
Observations on Ameba Feeding on Infusoria, and Their Bearing on the Sur- 
face-Tension Theory By S. O. Mast and F. M. Root 188 
On the Effect of Removal of the Pronephros of the Amphibian Embryo 
By Ruth B. Howland 231 
The Sex of Parthenogenetic Frogs By Jacques Loeb 313 
The Distribution of the Chondriosomes to the Spermatozoa in Scorpions 
By Edmund B. Wilson 321 
The Neuromuscular Structure of Sea-Anemones . .By G. H. Parker and E. G. Titus 339 
Differential Mitoses in the Germ-Cell Cycle of Dineutes Nigrior 
By R. W. Hegner and C. P. RusseU 356 
