10191 METEOROLOGY. 117 



conforming to the isothermal trend. In those regions there are five general 

 provinces, as follows: The subtropical coast, the cotton belt, the corn and 

 winter wheat belt, the spring wheat belt, and the hay and pasture region." 



Monthly Weather Review ( U. S. Mo. Weather Rev., 1,6 (1918), Nos. 7, pp. 

 807-352, pis. 12, figs. 8; 8. pp. 853-400, pis. 11,, figs. 18).— In addition to weather 

 forecasts, river and flood observations, and seismological reports for July and 

 August, 191S ; lists of additions to the Weather Bureau Library and of recent 

 papers on meteorology and seismology; notes on the weather of the months; 

 solar and sky radiation measurements at Washington, D. C, during July and 

 August, 1918; condensed climatological summaries; and the usual climato- 

 logical tables and charts, these numbers contain the following articles: 



No. 7. — Absoption and Radiation of the Solar Atmosphere, by S. Hirayama 

 (reprinted abs.) ; Internal Temperatures of the Sun, by A. Veronnet (reprinted 

 abs. ) ; Halo Phenomena Observed During July, 1918, by W. It. Gregg; Report 

 on Modes of Air Motion and the Equations of the General Circulation of the 

 Earth's Atmosphere (illus.), by G. P. Paine; Influence of Forests Upon the 

 Melting Snow in the Cascade Range (illus.), by A. A. Griffin; Snowfall on 

 Mount Rainier, Wash, (illus.), by L. C. Fisher; and On Severe Winters, by G. 

 Hellmann (reprinted abs.). 



No. 8. — Volcanic Eruptions and Solar Radiation Intensities (illus.), by H. H. 

 Kimball; Halo Phenomena Observed During August, 1918, by W. R. Gregg; 

 South Carolina Meteor of April 23, 1918, by R. H. Sullivan ; Photomicrographs 

 of Snow Crystals, and Methods of Reproduction (illus.), by W. A. Bentley; 

 Hot Spell of August, 1918, by A. J. Henry ; Night-Temperature Studies in the 

 Roswell Fruit District (illus.), by C. Hallenbeck (see below); Ice Storms in 

 the Southern Appalachians, by V. Rhoades; Hourly Frequency of Precipitation 

 in Central Ohio and Its Relation to Agricultural Pursuits (illus.), by H. H. 

 Martin (see below) ; and Alleged Manufacture of Rain in Southern California, 

 by F. A. Carpenter. 



Climatological data for the United States by sections (U. S. Dept. Apr., 

 Weather Bur. Climat. Data, 5 (1918), Nos. 7, pp. 203, pis. 1,. figs. 2; 8, pp. 201,, 

 pis. 1,, figs. 2). — These volumes contain brief summaries and detailed tabular 

 statements of climatological data for each State for July and August, 1918, 

 respectively. 



Meteorological observations at Wisley, 1916, R. H. Curtis (Jour. Roy. 

 Hort. Soc, 43 (1918), No. 1, pp. 91,-106, figs. 1,).— The meteorological conditions, 

 especially temperature and rainfall, of each month of the year are summarized 

 and compared with conditions in other parts of the United Kingdom, with par- 

 ticular reference to horticultural work. 



The weather of the year was in general cold and wet, with a marked defi- 

 ciency of bright sunshine and with more strong winds and gales than are 

 usually experienced. 



Night-temperature studies in the Roswell fruit district, C. Halt.enbeck 

 (U. 8. Mo. Weather Rev., 46 (1918), No. 8, pp. 361,-373, figs. 8).— The discussion 

 in this article deals with an irregular area of about 1,200 square miles lying 

 almost entirely west of the Pecos River. The influence of five factors is con- 

 sidered, especially in relation to the forecasting of frosts: "(1) The importation 

 of warmer or colder air, (2) topographical influences, (3) air drainage, (4) mix- 

 ture of the lower air with the air of higher levels, and (5) local inequalities 

 in the heating and cooling of the ground and lower air." 



Hourly frequency of precipitation in central Ohio and its relation to agricul- 

 tural pursuits, H. H. Martin (U. S. Mo. Weather Rer., 46 (1918). No. 8, pp. 875. 

 376, figs. 4)- — This article presents by months and seasons the peculiarities of 



