International Union for Co-operation in Solar Research. 



Members of the Fourth Conference. 



Professor J. 



Mr. I hai b s 



S. Ann s. 



G. Abbot, 



Mr. Walter S. Adams, 

 Mr. Harold D. Babcock, 

 Professor J. 0. Backlund, 

 Prof< ssor E. B. Barnard, 

 Professor A. Belopolsky, 



M. Jean Hosier. 



Professor F. P. Brackett, 

 Miss Cora G. Burwell, 

 Professor W. \V. Campbell, 

 Professor C. A. Chant, 

 M. Henri Chretien, 

 Rev. I'. R. Cirera, S. J., 

 Dr. W. w. Coblentz, 

 Rev. A. L. Cortie, S. J., 

 M. A. Cotton, 

 M. H. Deslandr. s, 

 Professor X. Donitch, 

 Mr. Frank L. Drew, 

 Profl ssor P. \V. Dyson. 

 Mr. Perdinand BUerman, 

 Dr. P. Eversheim, 

 Professor Charles Fabry, 

 Dr. Edward A. Path, 

 Mrs. W. P. Finning, 

 Mr. F. E. Fowl.. 



Professor A. Powler, 



Professor Philip Fox, 

 Professor E. B. Frost, 



Dr. Henry <;. Gale, 

 Professor L. II. Gilmore, 

 Miss CI. ini n! ina D. Griffin, 

 Professor George E. Hale, 



M. M. I la my. 

 Professor J. Hartmann, 

 Professor K. Haussmann, 

 Prof. .1. V. Hepperger, 

 Major E. H. Hills, " 

 Professor W. J. Humphreys, 

 M. Idrac, 



Professor .1. c. Kapteyn, 

 Professor H. Kaysir, 

 Dr. Arthur S. King, 

 Professor 1 1. Koni n. 

 Professor P. Kuestner, 

 Mr. C. 0. Lampland, 

 sir Joseph Lai mor, 

 Miss Jennie B. Lasbj . 

 Professor A. 0. Leuschner. 

 Professor H. C. Lord. 

 Professor A. G. McAdie, 

 Dr. Walter M. Mitchell, 

 Professor II. F. Newall, 

 Mr. F. G. Pease, 

 Professor E. ('. Pickering, 

 J. S. Plaskett, Esq. 

 Comte A. de la Banme I'lnvinel 

 Professor E. Pringsheim, 

 I'l ol'essor P. 1'niseux. 

 Professor A. Ricco, 

 Professor W. G. Sitchey, 

 Professor A. L. Rotch. 

 Dr. Henry Xorris Russell, 

 Professor J. R. Rvdberg, 

 Dr. Oharl.s K. St.' John, 



Johns Hopkins University, 

 Smithsonian Astrophysical 



( llisi i vat. n y. 

 Mt. Wilson Solar Observatory, 



Mt. Wilson Solar Observatory, 

 Observatoire de Poulkovo, 

 Yerki s Observatory, 

 Observatoire de Poulkovo, 

 Observatoire de Meudon, 

 Pomona College, 

 Mt. Wilson Solar Observatory, 

 Lick Observatory, 

 University of Toronto, 

 Observatoire de Nice, 

 t lbs. rvatorio del Ebro, 

 Bureau of Standards, 

 stonyhurst College Observatory, 

 Ecole Xormale Superieure, 

 Observatoire de Meudon, 

 Observatoire de 1' Universite, 

 Mt. Wilson Solar Observatory, 

 Royal < Observatory, 

 Mt. Wilson Solar Observatory, 

 University of Bonn, 

 Universite de Marseilles. 

 Alt. Wilson Solar Observatory, 

 Harvard College Observatory, 

 Smithsonian Astrophysical 



Observatory, 

 Imperial College of Science 



and Technology . 

 Dearborn ( Ibservatory, 

 Yerkes Observatory, 

 University of Chicago. 

 Throop Polytechnic Institute. 

 Mt. Wilson S.>lar Observatory, 

 Alt. Wilson Solar Observatory, 

 Observatoire de Paris, 

 Koenigliche Sternwarte, 

 Technische Hochschule, 

 Imperial Observatory, 

 32 Prince's Garden, 

 U. S. Weather Bureau, 

 Observatoire de Meudon. 

 Astronomical Laboratory, 

 University of Bonn, 

 Mt. Wilson Solar Observatory, 

 Physikalischcs Institut, 

 Koenigliche Sternwarte, 

 Lowell Observatory, 

 Royal Society. 



Mt. Wilson Solar Observatory, 

 University of California, 

 Emerson McMillin Obsy., 

 U. S. Weather Bureau, 

 Detroit Observatory. 

 University < Observatory, 



Mt. Wilson Solar Observatory. 



Harvard College Observatory, 



I '..minion Observatory, 



Rue de la Baume, 



University of Breslau, 



Observatoire de Paris, 



< •sservatorio astrofisico, 



Mt. Wilson Solar Observatory, 



Blue Hill Observatory, 



Princeton University, 



University of Lund, 



Mt. Wilson Solar Observatory, 



Baltimore. Md. 

 Washington, D. C. 



Poulkovo, Russia. 

 Williams Bay, Wis. 

 Poulkovo, Russia. 

 Meudon, Prance, 

 Claremont, Cal. 



Mount Hamilton. Cal. 

 Toronto, Canada. 

 Xiee. Prance. 

 Tortosa, Spain. 

 Washington, D. C. 

 Lancashire, England. 

 Paris. France. 

 Meudon. France. 

 St. Petersburg, Russia. 



Edinburgh, Scotland. 



Bonn. Germany. 

 Marseilles, France. 



Cambridge, Mass. 

 Washington. D. C. 



South Kensington. 



London. England. 

 Evanston. 111. 

 Williams Bay, Wis. 

 Chicago, 111. 

 Pasadena. Cal. 



Paris, France. 

 Goettingt n, Germany. 

 Aachen, Germany. 

 Vienna, Austria. 

 London. England. 

 Washington, D. C. 

 Meudon. France. 

 Groningen, Holland. 

 Bonn, Germany. 



Muenster, Germany. 

 Bonn, Germany. 

 Flagstaff, Ariz'. 

 London, England. 



Berkeley, Cal. 

 Columbus, Ohio. 

 San Francisco, Cal. 

 Ann Arbor, Mich. 

 Cambridge, England. 



Cambridge. Mass. 

 Ottawa, Canada. 

 Paris, France. 

 Breslau. Germany. 



Paris, Fra 



Catania. Sicily. 



Hyde Park. Mass. 

 Princeton, X. .1. 

 Lund, Sweden. 



19 



