CONTENTS 
vii 
PAGE 
Low-Temperature Formation of Alkaline Feldspars in Limestone 
By Reginald A . Daly 659 
OCEANOGRAPHY 
Observations Upon the Alkalinity of the Surface Water of the Tropical 
Pacific By Alfred Goldshorough Mayer 548 
The Equilibrium of Tortugas Sea Water with Calcite and Aragonite 
By J. F. McClendon 612 
Diurnal Changes in the Sea at Tortugas, Florida By J. F. McClendon 692 
BOTANY 
Studies of the Genus Phytophthora By J. Rosenhaum 159 
The Classification of Vascular Plants By Edward W. Berry 330 
Growth of Isolated Sporophytes of Anthoceros . . . By Douglas Houghton Campbell 494 
The Synergetic Action of Electrolytes By Oran L. Raher 682 
Hapid Respiration after Death By A. R.C. Haas 688 
ZOOLOGY 
The Responses of Hydroids to Gravity By G.H. Parker 72 
The Lips and the Nasal Apertures in the Gnathostome Fishes, and Their Homo- 
LOGUES in the Higher VERTEBRATES By Edward Phelps Allis, Jr. 73 
The Share of Egg and Sperm in Heredity By Edwin G. Conklin 101 
The Phylogenetic Development of Subapterous and Apterous Castes in the 
Formicidae By William Morion Wheeler 109 
The Food of Drosophila Melajstogaster Meigen By J. P. Baumberger 122 
Adult Hymenopterous Parasites Attached to the Body of Their Host 
By C. T. Brues 136 
Aortic Cell Clusters in Vertebrate Embryos By H. E. Jordan 149 
Rheotropism of Epinephelus Striatus Block By Hovey Jordan 157 
The Reactions of the Melanophores of the Horned Toad. By Alfred C. Redfield 202 
The Coordination of the Melanophore Reactions of the Horned Toad 
By Alfred C. Redfield 204 
The Effect of Degree of Injury, Level of Cut and Time within the Regen- 
erative Cycle Upon the Rate of Regeneration By Charles Zeleny 211 
Variability of Germ Cells of Sea Urchins By A. J. Goldfarb 241 
Transplantation of Limbs By Ross G. Harrison 245 
A Case of Normal Embryonic Atresia of the Esophagus By H. E. Jordan 264 
The History of the Primordial Germ Cells in the Loggerhead Turtle Embryo 
By H. E. Jordan 271 
Distribution of Gall Midges By E. P. Felt 349 
Sex-Determination and Sex-Differentiation in Mammals By Frank R. Lillie 464 
Evidence of Assortive Mating in a Nudibranch ByW.J. Crazier 519 
Coral Reefs of Tutuila, with Reference to the Mi^trray-Agassiz Solution 
Theory By Alfred Goldsborough Mayer 522 
The Appearance of Reverse Mutations in the Bar-Eyed Race of Drosophilia 
Under Experimental Control By H.G. May 544 
The Part Played by Alcyonaria in the Formation of Some Pacific Coral Reefs 
By Lewis R. Gary 545 
The Effect of Temperature on Linkage in the Second Chromosome of Droso- 
phila By Harold H. Plough 553 
