/j;i/f-T- 



PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHiIa ' ' 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LVIII. 



1919. 



No. 4. 



CONTENTS 



PAGE 



The Crocker Eclipse Expedition from the Lick Observatory, June 8, 



191S. 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 Observ-atory Eclipse Observations, June 8, 1919. Prominences 



and Coronal Arches. By CO. Lampland ..... 259 

 The Flash Spectrum. By S. A. Mitchell ..... 265 



Photo-electric Photometry of the 19 18 Eclipse. By Jakob Kunz and 



Joel Stebbixs .......... 269 



The Sproul Observatory Eclipse 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 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1919 



