CONTENTS 
Page 
Chemistry. — ^The Change of Molecular Kinetic Energy into Molecular Poten- 
tial Energy: The Entropy Principle and Molecular Association . . . 
Physics. — The Displacement of the Gravitating Needle in its Dependence on 
Mathematics. — Conditions Necessary and Sufficient for the Existence of a 
Mathematics. — ^Transformations of Cyclic Systems of Circles . By L. P. Eisenhart 555 
Chemistry. — New Measurements of the Vapor Pressure of Mercury . . . 
By Alan W. C. Menzies 558 
Chemistry. — Cohesion, Internal Pressure, Adhesion, Tensile Strength, Tensile 
Energy, Negative Surface Energy, and Molecul.\r Attraction .... 
By William D. Harkins 562 
Chemistry.— The Adhesion Between Mercury, Water, and Organic Substances, 
AND the Fundamental Principles op Flotation . . By William D. Harkins 569 
Genetics. — ^A Benign Tumor that is Hereditary in Drosophila . By Mary B. Stark 573 
Chemistry. — Metallic Salts of Pyrrol, Indol, and Carbazol 
By Edward C. Franklin 580 
Physiology. — Growth and Reproduction in Fowls m the Absence of Carotin- 
oiDS AND the Physiological Relation of Yellow Pigmentation to Egg 
Laying By Leroy S. Palmer 582 
Physics. — Radiationless Orbits By Edwin Bidwdl Wilson 588 
Physics. — ^The Effect Upon the Atom of the Passage of an Alpha Ray 
Through It By R. A. Millikan, 7. H. Gottschalk, and M. J. Kelly 591 
Statistics. — On the Embryological Basis or Human Mortality . By Raymond Pearl 593 
National Research Council.--Extracts from the Minutes of the Meeting of 
the Interim Committee 599 
By William D. Harkins 539 
Atmospheric Temperatures 
By Carl Barus 547 
Stieltjes Integral 
By R. D. Carmichael 551 
