CONTENTS 
Page 
Geology. — ^Atlantis and the Peemanency of the North Atlantic Ocean Bottom 
By Charles Schmhert 65 
Zoology. — The Responses of Hydroids to Gravity .... By G. H. Parker 72 
Zoology. — The Lips and the Nasal Apertures in the Gnathostome Fishes, and 
Their Homologues in the Higher Vertebrates By Edward Phelps Allis, Jr. 73 
Mathematics. — Natural and Isogonal Families of Curves on a Surface . . . 
By Joseph Lipka 78 
Mathematics. — Some Problems of Diophantine Approximation ■ The Series 
S e (Xn) AND the DISTRIBUTION OF THE PoiNTS (Xna) 
By G, H. Hardy and J. E. Littlewood 84 
Physics. — On Moseley's Law for X-Ray Spectra . . By Horace Scudder Uhler 88 
Mathematics. — A Note on the Fitting of Parabola:^ . . By John Rice Miner 91 
Astronomy. — Axes of Symmetry in Globular Clusters 
By Francis G. Pease and Harlow Shapley 96 
Zoology. — The Share of Egg and Sperm in Heredity . . By Edwin G. Conklin 101 
Petrology. — A Contribution to the Petrography of the Island of Baw6an, 
Netherlands Indies By J. P. Iddings and E, W. Morley 105 
Zoology. — The Phylogenetic Development of Subapterous and Apterous Castes 
IN THE Formicidae By WiUiam Morton Wheeler 109 
Physics. — Refractivity Determined Irrespective of Form, by Displacement 
Interferometry By Carl Bar us 117 
Zoology. — The Food of Drosophila Melanogaster Meigen By J. P. Baumherger 122 
Biology. — ^Temperature Optima for Human Energy . By Ellsworth Huntington 127 
Astronomy. — ^The Parallax of the Planetary Nebulae N. G. C. 7662 .... 
By Adriaan van Maanen 133 
Zoology. — ^Adult Hymenopterous Parasites Attached to the Body of Their 
Host ByCT. Brues 136 
