CONTENTS 
Page 
Astronomy. — Preliminary Results on the Color of Nebulae 
By Frederick H. Seares 553 
Chemistry. — The Action of Alkali in the Production of Lipolyttcally Active 
Protein ByK. George Folk 557 
Botany. — The Excretion «of Acids by Roots By A. R. Haas 561 
Astronomy. — Spectrographic Observations of Relative Motions in the 
Planetary Nebulae By W. W. Campbell aitd J. H. Moore 566 
Botany. — New Determinations of Permeability By S. C. Brooks 569 
Mathematics.^ — Point Sets and Cremona Groups. Part III. By Arthur A. Coble 575 
I^sics. — ^The Interferences 'of Spectra Both Reversed and Inverted . . . 
By Carl Barus 576 
Genetics. — Sex Intergrades in a Species of Crustacea . By Arthur M. Banta 578 
Mathematics. — Some Problems of Diophantine Approximation: A Remarkable 
Trigonometrical Series By G. H. Hardy and J. E. Litllewood 583 
Chemistry. — Steric Hindrance and the Existence of Odd Molecules ^Free 
Radicals) By Gilbert N. Lewis 586 
Mathematics. — ^Newton's Method in Gener.\l Analysis , By Albert A. Bennett 592 
Chemistry. — ^The Cobaltammines 
By William D. Harkins, R. E. HaU and W. A, Roberts 598 
National Research Council. — Report of the First Meeting 602 
. Reports of Meetings of the Executive Committee 605 
. Organization of the Research Council 607 
