ABBOTT LAWBENCE BOTCH, 

 Director of Blue Hill Meteorological Observatory, Hyde Park, Mass. 



SFANTE AUGUST AEBHENIUS, M.D., Ph.D., 

 Professor of Physics, University of Stockholm. 



FRANCIS EUGENE NIPHER, LL.D., 

 Professor of Physics, Washington University, St. Louis, Mo. 



HENRY HELM CLAYTON, 

 Meteorologist of Blue Hill Observatory, Hyde Park, Mass. 



LOUIS A. BAUER, C. E., 

 Lecturer on Terrestrial Magnetism, Johns Hopkins University. 



