CONTENTS 
Page 
Astronomy. — ^Nova Geminorum No. 2 as a Wolf-Rayet Star 
By Walter S. Adams and Francis G. Pease 391 
Astronomy. — A Singular Dark Marking on the Sky . . By E. E. Barnard 394 
Physics. — ^The Ruling and Performance of a Ten-Inch Diffraction Grating . 
By A. A. Michelson 396 
Physics. — A Highly Sensitive Electrometer . . . . By A. L. Parson 400 
Anthropology. — ^The Distribution and Functions of Tribal Societies Among 
THE Plains Indians; A Preliminary Report . . . By Clark Wissler 401 
Chemistry. — ^The Determination of Surf ace-Tension 
By T. W. Richards and L. B. Coombs 404 
Anthropology. — An Exhibit in Physical Anthropology . By Ales Hrdlicka 407 
Chemistry. — The Compressibilities of the Elements and their Relations to 
Other Properties ByT.W. Richards 411 
Astronomy. — Radial VELoaTiES Within the Great Nebula of Orion . 
By Edwin B. Frost 416 
Astronomy. — ^The Radial Velocities of the More Distant Stars 
By Walter S. Adams 417 
Zoology. — ^Localization of the Hereditary Material in the Germ Cells . 
By T, H. Morgan 420 
Mineralogy. — Researches on the Chemical and Mineralogical Composition of 
Meteorites By George P. Merrill 429 
Mathematics. — On the Representation of Arbitrary Functions by Definite 
Integrals By Walter B. Ford 431 
Physiology. — ^The Lymphocyte as a Factor in Natural and Induced Resistance 
to Transplanted Cancer . . By James B, Murphy and John J. Morton 435 
Mathematics. — Some Theorems Connected with Irrational Numbers 
By William Duncan MacMUlan 437 
