The SciencesRecent Progress in Astrophysics—IIMany Important Discoveries That Add to Our Knowledge of the Heavenly BodiesBy C. G. Abbot on July 24, 1915AdvertisementABOUT THE AUTHOR(S)Recent Articles by C. G. AbbotScience Replies to Secretary Wallace's Article: 'The Scientist in an Unscientific Society'Rotating Projectiles from Smooth-Bore Guns, Smothering a Fire Beneath a Combustible Blanket and moreThe Smithsonian “Solar Constant” Expedition to Calama, Chile