118 EXPERIMENT STATION" EECOED. 



meteorology and seismology, notes from the Weather Bureau library, the weather 

 of these months, a condensed climatological summary, climatological tables 

 and charts, and seismological reports, these numbers contain the following 

 articles : 



No. i.— The Snowfall of the Eastern United States (illus.), by C. F. Brooks; 

 The Rainfall of the Northeastern United States (illus.), by B. C. Wallis; The 

 Distribution of the Rainfall in the Eastern United States (illus.). by B. C. 

 Wallis (see p. 117); "Monsoon" Rainfall, by B. C. Wallis; On the Use of 

 "Average," " Mean," " General," by H. R. Mill ; Temperatui-e and Spring Wheat 

 in the Dakotas (illus.), by T. A. Blair (see p. 117) ; An Eight-Day Mechanically 

 Recording Rain Gage (illus.), by C. F. Marvin; New Meteorological Stations 

 in Korea, by R. S. Curtice ; Meteorological Radiotelegrams to Mariners from 

 Scheveuingen ; and The Water Resources of Strawberry Creek, Berkeley, Cal. 

 (illus.), by W. G. Reed and H. M. Loy. 



No. 2. — The Diurnal Period of the Wind Velocity ; The Ascent of Air above 

 Active Volcanoes, by K. Wegener ; A Correlation of Weather Conditions and 

 Production of Cotton in Texas (illus.), by J. B. Kincer (see p. 117) ; Relation 

 of Climate to Plant Growth in Maryland (illus.), by F. T. McLean (see p. 116) ; 

 New Zealand Raiuftill in 1914, 1)y D. C. Bates; and Gigantic Snowflakes. A 

 subject and author index of the Monthly Weather Review, 1914, is also included 

 in this number. 



Meteorological observations at the Massachusetts Agricultural Experi- 

 ment Station, J. E. Ostkander and R. E. McLain (Massachusetts Sta. Met. 

 Buls. 315, 316 {1915), pp. 4 each). — Summaries of observations at Amherst, 

 Mas.s., on pressure, temperature, humidity, precipitation, wind, sunshine, 

 cloudiness, and casual phenomena during March and April, 1915, are presented. 

 The data are briefly discussed in general notes on the weather of each month. 



Instructions for cooperative observers (U. 8. Dept. Agr., Weather Bur., 

 Instrument Div. Circs. B ami C, 5. ed. {1915), pp. 37, pi. 1, figs. 10). — ^This is 

 a fifth revised edition of this pamphlet, which is designed " to furnish coop- 

 erative observers with brief instructions for their guidance in taking and re- 

 cording meteorological observations, more especially of temperature and rainfall, 

 and for reporting earthquakes." The revision consists mainly in the addition 

 of a section relating to earthquake observations and an index. It is stated 

 that there are now about 4.500 cooperative observers in the United States, and 

 that the records furnished by them "are of great value in affording informa- 

 tion upon which many of the important publications of the Weather Bureau 

 are based, and it is the policy of the Bureau to foster and encourage the 

 keeping of such records." 



These observers receive no money compensation, but are loaned the necessary 

 instruments and regularly receive such of the publications of the Weather 

 Bureau as can be furnished free of cost. The conditions under which instru- 

 ments may be secured are explained and instructions are given for the erection 

 and care of instruments and for making and recording observations. 



SOILS— EERTILIZESS. 



Colloid chemistry in the study of soils, K. K. Gedkoits {Zhur. Opytn. 

 Agron. {Russ. Jour. Expt. Landw.), 15 {191Jf), No. 3, pp. 181-216) .—This is the 

 second communication on the subject (E. S. R., 28, p. 516), and deals with (1) 

 the speed of the exchange reaction in the soil, and (2) the colloidality of soils 

 saturated with different ba.ses and the color method for determining the quantity 

 of colloids in the soil. 



