PROCEEDINGS OF THE ACADEMY AND AFFILIATED 



SOCIETIES 



THE WASHINGTON ACADEMY OF SCIENCES 



The 92d meeting of the Washington Academy of Sciences was a 

 dehghtful all day, May 16, 1914, excursion of about 150 members to 

 Annapolis and the United States Naval Academy, Through the kind- 

 ness of the Navy Department and the Superintendent of the Naval 

 Academy, Capt. W. S. Fullam, many courtesies, including a trip up 

 the Severn and return on torpedo boats, were extended to the visiting 

 guests. The weather was ideal, and the excursion, under the man- 

 agement of the Committee on Meetings, in every way a success. 



The 93d meeting of the Washington Academj^ of Sciences, a busi- 

 ness meeting, with President White in the chair and attended by 

 twenty members, was held in the Cosmos Club on May 28, 1914. 



The revised bj-laws, as proposed on May 5, 1914, were adopted, 

 with but one amendment, namely, that the life membership fee shall 

 be $75, instead of, as formerty, $100. 



At the suggestion of the corresponding secretary. Dr. Burgess, it 

 was agreed that the memorial volumes of the Royal Society of London, 

 after being kept on exhibition for a time at the Cosmos Club, be given 

 to Dr. L. O. Howard, who was the Academy's official representative 

 at the meetings in question. 



Dr. G. R. Olshausen, of the Bureau of Standards, was elected to 

 resident membership. 



W. J. Humphreys, Recording Secretary. 



THE PHILOSOPHICAL SOCIETY OF WASHINGTON 



The 743d meeting was held on October 10, 1914, at the Cosmos Club, 

 Vice President Eichelberger in the chair; 25 persons present. 



]\Ir. H. H. Kimball read a paper on Measurements of the total radia- 

 tion received on a horizontal surface from the Sun and sky. From records 

 at Mt. Weather since 1912 of the Callendar horizontal recording pyr- 

 heliometer, it has been found that the total radiation per square centi- 

 meter of horizontal surface, with the clearest sky, varies from 250 

 calories per day on December 20, to 765 calories on June 10. The 

 average daily radiation in summer is about 68 per cent of that received 

 on clear days, and in winter it is about 63 per cent. The maxinmm 

 solar radiation at normal incidence varies from 1.37 calories per minute 

 per square centuneter in January, to 1.50 calories in May and Septem- 

 ber. The total radiation on a horizontal surface with a clear sky varies 



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