320 



SCIENCE 



[N. S. Vol. LIII. No. 1370 



tion and transmission factors (by title) : Enoch 

 Karkee, Bureau of Standards 



A comparison of retinoscopic, suijeotvve and 

 finally acceptable ocula/r corrections: Chables 

 iSheard, American Optioal Company. 



A new method of joining glass: 0. O. Faiechild, 

 Bureau of Standards. 



The effect of variations in intensity of illumina- 

 tion of functions of importance to the worlcing 

 eye (by title) : C. E. Ferree and G. Band, Bryn 

 Mawr College. 



Optical determination of stress in transpa/rent ma- 

 terials: A. L. Kimball, General Eleotrie Co. 



The following papers were contributed by the 

 Optioal Society to a joint meeting with the Ameri- 

 can Physical Society: 

 Photographic reproduction of tone: L. A. Jones, 



Eastman Kodak Company. 

 The spectral distribution of energy required to 

 evolce the gray sensation: Irwin G. Priest, Bu- 

 reau of Standards. 

 The propagation of light in rotating systems: L. 

 SiLBERSTEiN, Eastman Kodak Company. 



The next meeting will be held in Rochester in 

 October, 1921. Because of the optical industries 

 centered in and near Rochester and the proximity 

 to universities in which much attention is given to 

 optics, it is expected that this will be a particu- 

 larly notable and profitable meeting. The pro- 

 gram will be announced about the end of Septem- 

 ber. Titles may be submitted to the secretary at 

 any time prior to that date. 



Aji important feature of the society's work lies 

 in its continuous Committee on Standards and 

 Nomenclature. This committee includes a number 

 of subcommittees dealing with specific fields, such 

 as: colorimetry, iphotographic materials, photom- 

 etry, polarimetry, projection, pyrometry, reflec- 

 tometry, refractoraetry, spectacle lenses, spec- 

 trophotometry, speetroradiometry, visual refrac- 

 tion, visual sensitometry and wave-lengths. 

 Through the work of these committees the society 

 is gradually bringing into being a body of stand- 

 ard data and standard nomenclature which will 

 contribute materially to the progress of science. 



The first number of the Journal of the Optical 

 Society was issued under date of January, 1917. 

 The publication was designated as ' ' bi-monthly, ' ' 

 but during the war the dates of issue were neces- 

 sarily irregular and the publication discontinuous. 

 Librarians and others wUl be interested in the fol- 

 lowing statement of issues. During the calendar 

 years 1917-1919 inclusive there were six separate 

 issues designated as follows : 



Vol. I., No. 1, January, 1917. 



Vol. I., Nos. 2-3, March-May, 1917. 



Vol. I., No. 4, July, 1917. 



Vol. I., Nos. 5-6, September-November, 1917. 



Vols. II.-III., Nos. 1-2, January,March, 1919. 



Vols. II.-III., Nos. 3-6, May-November, 1919. 

 There were no issues in the calendar year 1918. 



Beginning with January, 1920, the size and style 

 of the journal were changed, and it is now issued 

 regularly bi-monthly. 



The by-laws state eligibility to membership as 

 follows: "Any person who has, in the opinion of 

 the council, contributed materially to the advance- 

 ment of optics shall be eligible to regular member- 

 ship in the society. Any person or corporation 

 interested in optics is eligible to associate member- 

 Ship. " Associate members have the same privi- 

 leges and duties as regular members except that 

 they may not vote nor hold of&ee. 



The annual dues are five dollars for both classes 

 of individual members and fifty dollars for cor- 

 poration members. Dues include subscription to 

 the journal. 



Applications for membership should be ad- 

 dressed to Irwin G. Priest, secretary. Optical So- 

 ciety of America, c/o Bureau of Standards, Wash- 

 ington, D. C. 



Payment of dues should not accompany applica- 

 tion. Bin will be sent after action is taken on the 

 application. 



Information in regard to the journal may be 

 obtained by addressing Paul D. Foote, editor. 

 Journal Optical Society of America, c/o Bureau of 

 Standards, Washington, D. C. 



Sample copies of the journal can not be fur- 

 nished free, but the complete table of contents for 

 1920 will be mailed free on request 



A cordial invitation to become members is ex- 

 tended to all persons who are interested in the pur- 

 poses and activities of the society. 



Irwin G. Priest, 



Secretary 



SCIENCE 



A Weekly Journal devoted to the Advancement of 

 Science, publishing the official notices and pro- 

 ceedings of the American Association for 

 the Advancement of Science 



Published every Friday by 



THE SCIENCE PRESS 



LANCASTER. PA. GARRISON, N. Y. 



NEW YORK, N. Y. 



Entered to the post-d£ce at LancmBlci, Pa., ai lecond clan nuttei 



