246 CARNEGIE INSTITUTION OF AVASHINGTON. 



Observatory photographer. Dailj' photography of the sun with the 

 Snow telescope has been carried on by Messrs. Ellernian, van Maanen, 

 and JVIonk. Mr. F. G. Pease has continued his photographic and 

 spectroscopic observations of nebulae, star-clusters, Novse and variable 

 stars, in addition to his duties in charge of instrument design. Dr. 

 Arnold Kohlschiitter continued his stellar spectroscopic observations 

 and the study of stellar spectra until called early in August to serve 

 as a reserve in the German army. He was captured by the British 

 at Gibraltar, and is detained there as a prisoner of war. Dr. Adriaan 

 van Maanen has begun a photographic investigation of stellar paral- 

 laxes, assisted in the stellar spectroscopic observations, and measured 

 the spectra showing the general magnetic field of the sun. Many of 

 these spectra were taken by Mr. Monk, who has also assisted in the 

 stellar spectroscopic observations. Dr. Harlow Shapley, who joined 

 the staff in April 1914, has devoted most of his time to investigations in 

 stellar photometry. Mr. R. S. Capon, of the University Observatory, 

 Oxford, who joined the staff on July 25, 1914, is engaged in the measure- 

 ment of solar magnetic field spectra and other observational and theo- 

 retical work. 



Professor J. C. Kapteyn, Research Associate, arrived in Pasadena on 

 July 21, and will remain in California until December. During the 

 year he has completed an extensive investigation on the parallaxes of 

 the brighter helium stars (Mount Wilson Contribution No. 82) and con- 

 tinued his studies on star streaming, light scattering in space, and other 

 stellar problems. Professor Carl Stormer, who visited the Observatory^ 

 as Research Associate in 1912, has extended his investigations on the 

 electromagnetic theory of the hydrogen flocculi to the bipolar type. 

 Professor Peter Paul Koch returned to Munich in September 1913, 

 after completing his experiments on the application of the registering 

 micro-photometer to the study of solar, stellar, and laboratory spectra. 

 Dr. J. A. Anderson, whose duties at the Johns Hopkins University 

 required his return to Baltimore in September 1913, cooperated with 

 Mr. Jacomini in the work of completing and testing the machine for 

 ruling gratings. Mr. P. J. van Rhyn, after finishing the observational 

 part of his investigation on the color indices of stars, returned to 

 Holland in May. 



The Observatory has lost a faithful and efficient member in the 

 person of Miss Evelyn Wilhoit, whose death on April 22 was deeply 

 felt by all of her fellow-workers. Her loyaltj- and devotion will alwaj's 

 be associated with the first decade of the Observatory's history. 



Director C. G. Abbot, of the Smithsonian Astrophysical Observatory, 

 carried on his studies of the solar constant and related problems on 

 Mount Wilson during the periods September 1 to November 9, 1913, 

 and May 25 to July 4, 1914, when he left for Australia. Since the 

 last date the work has been continued bj'- Mr. L. B. Aldrich. 



