I 
CONTENTS 
Page 
Mathematics. — Differential Equations and Implicit Functions in Infinitely 
Many Variables By William L. Hart 309 
Zoology. — ^The Sex of Parthenogenetic Frogs By Jacques Loeb 313 
Genetics. — De Vriesian Mutation in the Garden Bean, Phaseolus Vulgaris 
By /. Arthur Harris 317 
Physiology. — Studies of Ductless Glands by the Electrical Method . . . 
By W. B. Cannon 319 
Zoology. — ^The Distribution of the Chondriosomes to the Spermatozoa in 
Scorpions By Edmund B, Wilson 321 
Anthropology. — ^New Data on the Archaeology of Venezuela 
By Herbert J. Spinden 325 
Physics. — ^Note on the Phosphorescence of Uranyl Salts , By Edward L. Nichols 328 
Astronomy. — ^The Pyranometer: An Instrument for Measuring Sky Radiation 
By C. G. Abbot and L. B, Aldrich 333 
Mathematics. — Note on Lucas' Theorem By M. B. Porter 335 
Mathematics. — ^A Variable System of Sevens on Two Twisted Cubic Curves 
By H, S. White 337 
Zoology. — The Neuromuscular Structure of Sea-Anemones . 
By G. H, Parker and E. G. Titus 339 
Chemistry. — Change of the Ionization of Salts in Alcoholic Solvents with 
the Concentration . ... By Frederick G. Keyes and W. J. Winninghoff 342 
