CONTENTS 



Page. 



The Parasitic Aculeata, A Study in Evolution. By William 

 Morton Wheeler i 



The Relation of the Diet to Pellagra. By E. V. AIcCollum. . 41 



Evolution and Mystery in the Discovery of America. By Edwin 

 Swift Balch 55 



Tatar Material in Old Russian. By J. Dyneley Prince 74 



The Energy Loss of Young Women during the Muscular Ac- 

 tivity of Light Household Work. By Francis G. Benedict 

 and Alice Johnson 89 



Alternating-current Planevector Potentiometer Measurements 

 at Telephonic Frequencies. By A. E. Kennelly and Edy 

 Velander 97 



Some Scientific Aspects of the Meteorological Work of- the 

 United States Army. By Robert A. Millikan 133 



Detecting Ocean Currents by Observing their Hydrogen-ion 

 Concentration. By Alfred Goldsborough Mayor 150 



Recent Discoveries of Fossil Vertebrates in the West Indies and 

 their Bearing on the Origin of the Antillean Fauna. By W. 

 D. Matthew 161 



The Relative Contribution of the Staple Commodities to the 

 National Food Consumption. By Raymond Pearl 182 



Self-Luminous Night Haze. By E. E. Barnard 223 



Graphical Representation of Functions of the nth Degree. By 

 Francis E. Nipher 236 



The Crocker Eclipse Expedition from the Lick Observatory, 

 June 8, 1918. By W. W. Campbell 241 



The Expedition of the Mount Wilson Observatory to the Solar 

 Eclipse of June 8. 1918. By J. A. Anderson 255 



The Lowell Observatory Eclipse Observations, June 8, 1918. 

 Prominences and Coronal Arches. By C. O. Lampland. . . 259 



The Flash Spectrum. By S. A. Mitchell 265 



iii 



