METEOROLOGY. 

 The rainfall regions shown on this map are as follows: 



Summary of the rainfall regimes of the several States. 



319 



The distribution of the rainfall in the western United States, B. C. Waixis 

 {Mo. Weather Rev., 43 (1915), No. 4, pp. 170-175, figs. i9).— This is a discussion 

 similar to that of rainfall intensity of the eastern United States already noted 

 (E. S. R., 33, p. 117). It contains twelve monthly maps of equipluves besides 

 charts of rainfall intensity, for the region west of the 103d meridian. These 

 show " a notable regularity almost throughout the year, a very wet area gradu- 

 ally fades off into a very dry district. The exceptional month is October, when 

 the raininess is uniformly below the average, and the elevated lands are wetter 

 than the lowlands. The second general feature is the absence of very marked 

 raininess or dryness on the mountains at any time of the year. This fact is 

 well shown by the graphs for the mountain divisions. Consequently, in a 

 broad way, the West contains three regions with three types of rainfall : 



(1) The far west, including the coast lands, with great rainfall intensity 

 throughout the period November to March — i. e., winter rains; (2) the moun- 

 tains, never very wet, never very dry; (3) the eastern slopes, with great rain- 

 fall intensity in the north from April to June, and in the south from July to 

 September— i. e., summer rains." 



A study of the rainfall charts for the western United States in conjunction 

 with those of the eastern United States " indicates that the rainfall of the 

 United States as a whole is determined by (1) continental influences which 

 are exerted over a broad triangle of country, with the vertex to the south and 

 with the edge of the Rocky Mountains as the eastern limb of the triangle; 



(2) oceanic influences exerted upon the coastal lowlands, (a) on the west 

 from the Pacific and (b) on the east from the Atlantic; (3) intermediate 

 regions (a) the Rockies in the west and (b) the western Appalachians on 

 the east; and (4) direct solar influences which are manifest with some ele- 

 ments of variety along the southern boundary as far west as Yuma, Ariz." 



The infl^uence of a western yellow pine forest on the accumulation and 

 melting of snow, A. J. Jaenicke and M. H. Foerstee (Mo. Weather Rev., 43 

 {1915), No. S, pp. 115-126, pis. .?).— This article reports a study of the influence 

 of a virgin western yellow-pine forest on the accumulation and melting of 

 snow. This study was made at the Fort Valley (Forest) Experiment Station, 



