CONTENTS 
Page 
Physics. — On The Mobilities of Gas Ions in High Electric Fields 
By Leonard B. Loeb 345 
Anatomy. — ^The Relation of MyiIlin to the Loss of Water in the Mammalian 
Nervous System With Advancing Age . ... By Henry H. Donaldson 350 
Zoology. — Differential Mitoses in the Germ-Cell Cycle of Dineutes Nigrior 
By R. W. Eegner and C. P. Russell 356 
Mineralogy. — Some Minee!als from the Fluorite-Barite Vein Near Wagon 
Wheel Gap, Colorado By Esper S. Larsen and Roger C. Wells 360 
Physiology. — ^The Processes Taking Place in the Body by Which the Number 
OF Erythrocytes Per Unit Volume of Blood is Increased in Acute Experi- 
mental Polycythaemia .By Paul D. Lamson 365 
Physiology. — ^The Influence of Morphin Upon the Elimination of Intraven- 
ously Injected Dextrose in Dogs . . By I. S. Kleiner and S. J. Meltzer 369 
Astronomy. — ^The Work of the American Meteor Society in 1914 and 1915 . . 
By Charles P. Olivier 372 
Physics. — The Light Excitation by Slow Positive and Neutral Particles . . 
By A. J. Dempster 374 
Astronomy. — ^An Apparent Dependence of the Apex and Velocity of Solar 
Motion, as Determined from Radial Velocities, Upon Proper Motion . . 
By C. D. Perrine 376 
Physics. — Channeled (^rating Spectra, Obtained m Successive Diffractions . 
By C. Barus 378 
Genetics. — The Effect of Parental Alcoholism (and Certain Other Drug 
Intoxications) ,Upon the Progeny in the Domestic Fowl. By Raymond Pearl 380 
Zoology. — ^The Effectors of Sea-Anemones By G. H. Parker 385 
Astronomy. — PrelIminary Evidence of Internal Motion in the Spiral Nebula 
Messier 101 By A. van Maanen 386 
Symposium on the Exploration of the Pacific: 
The Exploration of the Pacific ByW.M. Davis 391 
The Importance of Gravity Observations at Sea on the Pacific .... 
By John F. Hayford 394 
A New Method of Measuring the Acceleration of Gravity at Sea . . . 
By Lyman J. Briggs 399 
The Problem of Continental Fracturing and Diastrophism in Oceanica 
By Charles Schuchert 407 
The Petrology of Some South Pacific Islands and its Significance . . . 
By Joseph P. Iddings 413 
In Relation to the Extent of Knowledge Concerning the Oceanography 
OF the Pacific ............. By G. W, Littlehales 419 
Marine Meteorology and the General Circulation of the Atmosphere . 
By Charles F. Marvin 421 
On the Distribution OF Pacific Invertebrates ByWm.H.Dall 424 
The Marine Algae of the Pacific ByW.G. Farlow 424 
The Pacific as a Field for Ethnological and Archaeological Investigation 
By J. Walter Fewkes 427 
Mid-Pacific Land Snail Faunas By H. A. Pilsbry 429 
Some Problems of the Pacific Floras By Douglas H. Campbell 434 
Zoology. — Nervous Transmission in Sea-Anemones By G. H. Parker *437 
ZodLOGY. — The Responses of the Tentacles of Sea-Anemones. By G. H. Parker 438 
