330 HANDBOOK OF LEARNED SOCIETIES 



The problem has been more definitely stated by the Board of Man- 

 agers thus: "Whether or not all rays in the spectrum known at the 

 time the offer was made, namely March 23, 1859, and comprised be- 

 tween the lowest frequency known thermal rays in the infra-red and 

 the highest frequency known rays in the ultra-violet, which in the 

 opinion of the committee lie between the approximate frequencies of 

 2xio I 4 double vibrations per second in the infra-red and 8xio J 4 in 

 the ultra-violet, travel through free space with the same velocity." 

 The original sum of $1,000 has increased to about $3,000. One award 

 of $1,000 made in 1907 for a partial demonstration of this problem, 

 viz : for the ultra-violet rays. 



JOHN SCOTT LEGACY PREMIUM AND MEDAL, founded 1816. A copper 

 medal and premium of $20 awarded by the Board of Directors of 

 City Trusts of the city of Philadelphia, on recommendation of the 

 Franklin Institute to "ingenious men and women who make useful 

 inventions." 



ELLIOTT CRESSON MEDAL, founded in 1848. A gold medal of the value 

 of $20 awarded for discoveries in the arts or sciences, or for the in- 

 vention or improvement of some useful machine, or for some new 

 process or combination of materials in manufactures or for in- 

 genuity, skill or perfection in workmanship. 



EDWARD LONGSTRETH MEDAL OF MERIT, founded 1890. A silver medal 

 awarded for useful invention, important discovery, and meritorious 

 work in, or contributions to, science or the industrial arts. 



CERTIFICATE OF MERIT. Awarded for worthy inventions, discoveries or 

 productions. 



All awards are made through the Committee on Science and the 

 Arts. Applications, accompanied by descriptions, drawings, etc., must 

 be made to the Secretary of the Institute, from whom further informa- 

 tion may be obtained. 



Friends' Historical Society of Philadelphia. 



Address. Philadelphia, Pa. President: Isaac Sharpless, Haverford Col- 

 lege, Haverford, Pa. Secretary : Albert T. Bell, Atlantic City, N. J. 

 History. Founded May 16, 1904. 



Object. To collect manuscript and other material for the elucidation of the his- 

 tory of the Friends in America. 



Distinct from the Friends' Historical Association, organized in Philadelphia 1874, 

 (for publications, see Griffin, Bibl. Amer. hist, soc.) ; and from the Friends' His- 

 torical Society, organized Jan. 1904, as a branch of the English society of the same 

 name, which publishes Journal . . . v. I-IV, 1903/04-07, (London and Philadelphia. 8.) 

 obtainable at the American office, 1010 Arch Street, Philadelphia. {Price: $1.25 

 per vol.) 



