cover-title, p. 611-669, il. 9 p. of pl. and maps, 4°
Notes:
Notes:
SPECIAL ARTICLES.—Solar and sky radiation measurements during Nov. 1916; by Herbert H. Kimball.—Duration and intensity of twilight; by Herbert H. Kimball.— Von Bezold's description of twilight; [translated by C. Abbe, jr.].—Mairan's description of anti-twilight [French and English].—Explanations of western purple light and eastern afterglow (Nachglühen), by Albert Heim; translated by C. Abbe, jr.—Twilight phenomena in Arizona, Sept.-Dec. 1916; by Andrew Ellicott Douglass.—Solar halo of Sept. 28, 1916, at Miami, Fla.; by Richard W. Gray.—Daytime and nighttime precipitation and their economic significance; by Joseph Burton Kincer.—Frequency curves of climatic phenomena; by Howard Ross Tolley.—Graphic method of representing and comparing drought intensities; by Thornton T. Munger.—Six years of snowfall measurements in Carson, Walker, and Truckee watersheds; by H. F. Alciatore.