iv CONTENTS. 



Page 



Photo-electric Photometry of the 1918 Echpse. By Jakob 

 KuNz and Joel Stebbins 269 



The Sproul Observatory Echpse Expedition, June 8, 1918. 

 Coronal Arches and Streamers. By John A. Miller 272 



Results of Observations of the Eclipse by the Expedition from 

 the Yerkes Observatory. By Edwin B. Frost 282 



The Basis of Sex Inheritance in Sphserocarpos. By Charles 

 E. Allen " 289 



The Application of Sanitary Science to the Great War in the 

 Zone of the Army. By Bailey K. Ashford 317 



Star Clusters and Their Contribution to Knowledge of the Uni- 

 verse. By Harlow Shapley 337 



Hydration and Growth. By D. T. MacDougal 346 



Some Considerations on the Ballistics of a Gun of Seventy-five- 

 mile Range. By Arthur Gordon Webster 373 



On a New (?) Method in Exterior Ballistics. By Arthur Gor- 

 don Webster and Mildred Allen 382 



Characters and Restoration of the Sauropod Genus Camara- 

 saurus Cope. By Henry Fairfield Osborn and Charles 

 Craig Mook 386 



Trogloglanis Pattersoni, a New Blind Fish from San Antonio, 

 Texas. By Carl H. Eigenmann 397 



Polarized Light in the Study of Ores and INIetals. By Fred. E. 

 Wright 401 



On the Luciopimelodinae, a New Subfamily of the South Amer- 

 ican Siluridse. By Chas. E. Driver 448 



Minutes iii 



Index XV 



