SOILS FERTILIZEBS. 321 



by A. J. Jaenicke and M. H. Foerster (see p. 319) ; Atmospheric Influence on 

 Evaix)ration and Its Direct Measurement (illus.), by B. E. Livingston (see 

 p. 320) ; The Introduction of Meteorology into the Courses of Instruction in 

 Mathematics and Physics, by C. Abbe ; Lightning and Protection from It, by J. 

 Larmor ; Lightning Injury to Cotton and Potato Phints, by L. R. Jones and W. 

 W. Gilbert; Weather and Health; and Huntington on the Climatic Factor, by 

 W. J. Humphreys. 



No. 4. — Solar and Sky Kadiation Measured at Washington, D. C, during 

 April, 1915, by H. H. Kimball; The Origin of the Wind (illus.), by J. W. Sand- 

 strom; Some Recent Researches on the Motion of Fluids (illus.), by H. Bate- 

 man ;« The Distribution of the Rainfall in the Western United States (illus.), 

 by B. C. Wallis (see p. 319) ; The Rainfall Regime of the Several States (illus.), 

 by B. C. Wallis (see p. 318) ; Meteorological Observations Near Schiefflin, 

 Liberia, 1913-1914, by P. C. Day ; Monthly Weather Periodicity, by V. Koppen ; 

 Influence of the Moon on Weather; and Beaufort Wind Scale and New Rus- 

 sian Equivalents, by B. Galitzin. 



Climatological data for the United States by sections {TJ. 8. Dept. Agr., 

 Weather Bur. Climat. Data, 1 (1914), No. 13, pp. 386, pis. 2, figs. 4//).— This 

 number contains brief summaries and detailed tabular statements of climato- 

 logical data for each State for the year 1914. 



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

 Weather Bur. Climat. Data, 2 {1915), Nos. 3, pp. 234, pis. 2, figs. 7; 4, pp. 226, 

 pis. 2, figs. 12). — These numbers contain brief summaries and detailed tabular 

 statements of climatological data for each State for March and April, 1915, 

 respectively. 



Meteorological observat'ons at the Massachusetts Agricultural Experi- 

 ment Station, J. E. Ostrander, R. E. McLain, and D. Potter {Massaehnsctts 

 Sta, Met. Buls. 317, 318 {1915), pp. 4 each). — Summaries of observations at 

 Amherst, Mass., on pressure, temperature, humidity, precipitation, wind, sun- 

 shine, cloudiness, and casual phenomena during May and June, 1915, are pre- 

 sented. The data are briefly discussed in general notes o '. the weather of each 

 month. 



SOILS— FERTILIZEES. 



[Soil analyses], A. N. Hume {South Dakota Sta. Rpt. 1913, pp. 19-24).— 

 Incomplete chemical analyses of the brown sandy loam soil used in fertility 

 experiments previously noted (E. S. R., 29, p. 728) indicate that the average 

 nitrogen content of the surface soil to a depth of 6§ in. over an acre weighing 

 about 2,000,000 lbs. is 6,325 lbs. The acid-soluble phosphorus in the same 

 amount of soil avei'ages 1,151 lbs., and the incomplete analyses for potassium 

 indicate a content of 23.720 lbs. The results as a whole are taken to indicate 

 that phosphorus is the limiting element in this soil. 



Gola's osmotic theory of edaphism, F. Cavers {Jour. Ecology, 2 {1914), No. 

 4, pp. 209-231). — It is the object of this article to summarize a series of con- 

 tributions to edaphology by G. Gola. 



Colloidal phenomena, with special reference to soil colloids, are first briefly 

 considered as forming an essential part of the basis of Gola's theory. Gola's 

 main thesis is " that the relations between plants and the soil are chiefly 

 determined by the concentration of the soil solution and the limits between which 

 this may vary, and he lays special stress upon the contrasting characters of the 

 colloidal and crystalloidal constituents of the soil. , . . 



" Soils may be divided into two main groups — (1) soils in which the soil solution 

 is rich in mineral substances and its concentration is relatively high, though 



