CONTENTS 
Page 
Astronomy. — Confikmatory Experiments on the Value of the Solar Constant 
OF Radiation By C, G. Abbot, F. E. Fowle, and L. B. Aldrich 331 
Genetics. — ^Variation of Flower Size in Nicotiana 
By T. H. Goodspeed and R. E. Clausen 333 
Physiology. — Retention in the Circulation of Dextrose in Normal and De- 
pancreatized Animals, and the Effect of an Intravenous Injection of an 
Emulsion of Pancreas Upon This Retention. By I. S. Kleiner and S. J. Meltzer 338 
Genetics. — Parthenocarpy and Parthenogenesis in Nicotiana 
By T, E, Goodspeed 
Anthropology.— Exogamy and the Classificatory System of Relationship . . 
By Robert H. Lowie 346 
Mathematics. — Solution of an Infinite System of Differential Equations 
OF THE Analytic Type By F. R. Moulton 350 
Genetics. — Sex Ratio in Pigeons, Together with Observations on the Laying, 
Incubation and Hatching of the Eggs. By Leon J. Cole and Wm. F. Kirkpatrick 354 
Biochemistry. — ^Vividiffusion Experiments on the Ammonia of the Circulating 
Blood By Alice Rohde 357 
ASTR0N0MY.--126 Parabolic Orbits OF Meteor Streams . . By Charles P.Olivier 358 
Geology.— The Basil Silurian Formations of Eastern North America . . . 
By Charles Schuchert 359 
Genetics. — ^A Method of Obtaining Complete Germination of Seeds in Oenothera 
AND of Recording the Residue of Sterile Seed-Like Structures . . . 
By Bradley Moore Davis 360 
Chemistry. — ^The Osmotic Pressure of the Ions and op the Undissociated Mole- 
cules OF Salts in Aqueous Solution By Stuart J, Bates 363 
Physics.— The Extension of the Spectrum Beyond the Schumann Region. . . 
By Theodore Lyman 368 
Astronomy.— Unsymmetrical Lines in Tube-Arc and Spark Spectra as an Evi- 
dence op a Displacing Action in These Sources . , By Arthur S, King 371 
Mathematics.— On the Factorization of Various Types of Expressions . . 
By Henry Blumberg 374 
Astronomy. — ^The Direction of Rotation of Sun-Spot Vortices. By George E. Hale 382 
Astronomy. — Some Vortex Experiments Bearing on the Nature op Sun-Spots 
and Flocculi George P, Hale and George P. Luckey*SS5 
Notices of Biographical Memoirs 390 
