Apeil 1, 1921] 



SCIENCE 



319 



It solicits the suppoort and membership of all per- 

 aons "interested in optics" whatever their par- 

 ticular interest may be. The actual present scope 

 of the society's activities -will be best indicated by 

 the contents of its journal aind the program of its 

 latest meeting given below. 



The present membership of the society is about 

 two hundred and twenty and is increasing rapidly. 

 The officers for 1921 are: 



President, J. P. C. Southall, Columbia Univer- 

 sity, New York City. 



Vice-president, C. E. Mendenihall, University of 

 Wisconsin, Madison Wis. 



Secretary, Irwin G. Priest, Bureau of Standards, 

 Washington, D. C. 



Treasurer, Adolph Lomb, Bausoh & Lomb Optical 

 Co., Rochester, N. Y. 



Editor, Paul D. Poote, Bureau of Standards, 

 Washington, D. C. 



MEMBERS or THE COUNCIL IN ADDITION TO ABOVE 

 OPPICERS 



Fast-president (19S0), F. K. Eichtmyer, Cornell 

 University, Ithaca, N. Y. 



Elected Members at Large 19S1 : P. G. Nutting, 

 Westinghouse Research Laborart;ory, East Pitts- 

 burgh, Pa.; C. E. K. Mees, Eastman Research Lab- 

 oratory, Rochester, N. Y.; L. A. Jones, Eastman 

 Research Laboratory, Rodiester, N. Y. ; W. E 

 Porsythe, Nela Research Laboratory, Nela Park 

 Cleveland, Ohio. 



Reeenjt meetings were held in New York Feb 

 ruary 26-27, 1920, and Chicago, December 27-29 

 1920. The program of the ■ Chicago meeting f ol 

 lows: 



Courses in optics and optometry in Columbia Uni- 

 versity : James P. C. Southall, Columbia Uni- 

 versity. 

 Thermal expansion of wires used in glass seals: C. 

 G. Peters and C. H. Cragoe, Bureau of Stand- 

 ards. 

 Sefractive index of glass through the annealing 

 range: C. G. Peters and C. H. Cragoe, Bureau 

 of Standards. 

 Notes on the theory of photographic spectropho- 

 tometers: E. D. TiLLTEE, American Optical 

 Company. 

 A new ocular micrometer: Hermann Kellner, 



Bausch & Lomb Optical Co. 

 Presentation and Discussion of the Reports of the 

 Committees on Nomenclature and Standards: P. 

 G. Nutting, General Chairman. 



1. Colorimetry, L. T. Troland. 



2. Lenses and Optical Instruments, J. P. C. 



Southall. 



3. Optical Glasses, George W. Morey. 



4. Photographic Materials, W. E. Meggers. 



5. Photometry and Illumination, E. C. Crit- 



tenden. 



6. Polarimetry, F. E. Wright. 



7. Projection, L. A. Jones. 



8. Pyrometry, W. E. Eorsythe. 



9. Reflectometry, A. H. Taylor. 

 10. Refractometry, C. A. Skinner. 



11. Spectacle Lenses, E. D. TiUyer. 



12. Spectrophotometry, A. H. Pfund. 



13. Spectroradiometry, W. W. Coblentz. 



14. Visual Ssnsitometry, Prentice Reeves. 



15. Wave Lengths, W. F. Meggers. 



(About half of the above reports were presented 



before the general meeting by title only.) 



A comparison of monochromatic screens for optical 

 pyrometry: W. E. Foesythe, Nela Research 

 Laboratory. 



An improved form of Pickering polarimeter for 

 gloss measurements (by the polarization 

 method) : L. R. Ingeesoll, University of Wis- 

 consin. 



An unfamiliar anomaly of vision and its relation 

 to certain optical instruments: W. B. Ratton, 

 Bausch & Lomb Optical Co. 



Double refraction of glass tubing as indicating the 

 strains present: A. Q. Tool and C. G. Eichlin, 

 Bureau of Standards. 



Monocular and binocular perception of contrast 

 and brightness: Prentice Reeves, Eastman 

 Kodak Company. 



Systems of color standards: A. Ames, Jr., Dart- 

 mouth College. 



A new study of the leucoscope and its application 

 to pyrometry. (Extension of work reported at 

 N. Y., February, 1920) : Iewin G. Peibst, Bu- 

 reau of Standards. 



Address of the retiring president of ithe Optical 

 Society of America. Some outstanding prob- 

 lems of physiological optics: F. K. Richtmyee, 

 Cornell University. 



Atmospheric corrections for the Sarcourt Stand- 



, ard Pentane lamp: E. B. Rosa, E. C. Critten- 

 den, A. H. Taylor, Bureau of Standards. 



Some major problems in photometry: E. C. Crit- 

 tenden and J. F. Skogland, Bureau of Stand- 

 ards. 



Comparative tests as to the accuracy of various 

 methods for precision measurements of focal 

 lengths (by title) : W. O. Lytle and A. K. Ben- 

 nett, Bureau of Standards. 



The diffusion of light in a searchlight beam (by 

 title) : Enoch TCarrer and U. M. Smith, Bureau 

 of Standards. 



Further results on the heat of absorption of glass: 

 A. Q. Tool and C. G. Eichlin, Bureau of Stand- 

 ards. 



A recent new system of formulce for tracing rays 

 through a combination of lenses: James P. C. 

 Southall, Columbia University. 



Notes on lens computation: Hermann Kellnee, 

 Bausch & Lomb Optical Co. 



A new astronomical lens: Frank E. Ross, East- 

 man Kodak Company. 



Note on the extended theory of the sectored disTe 

 used in photometry (by title) : Enoch Kabeee, 

 Bureau of Standards. 



Measurements of aberrations of the eye: C. A. 

 Peoctoe and A. Ames, Jr., Dartmouth College. 



Characteristics of retinal image: A. Ames, Jr., 

 and C. A. Proctor, Dartmouth College. 



Some notes on oondenser correction in optical pro- 

 jection (by title) : G. W. Mofeit, Eastman Ko- 

 dak Company. 



The use of the Ulbricht sphere in measuring reflec- 



