BULLETIN 



Southern California Academy 

 of Sciences 



LOS ANGELES, CALIFORNIA 



Volume XIX, Part I. 



January, 1920 



COMMITTEE ON PUBLICATION: 



William A. Spalding, Chairman. 

 Anstruther Davidson, CM., M.D. Samuel J. Keese 



CONTENTS 



Page. 



Mt. Wilson Observatory 1 



The Practical Application of Climatic Data 6 



Cloud Photographs Made From Aloft 8 



Linanthus Saxiphilus 10 



Draba Saxosa 11 



Geological Structures Favorable to the Accumulation of Petroleum 13 



Applied Science , 21 



A Supplemental Bibliography of the Southern California Flora..... 24 



Transactions of the Academy : 29 



Office of the Academy, Room 719 Sari Fernando Building 

 Telephone 6S741 



