1920] , SOILS FERTILIZERS. 719 



Balloon Flight Made from Aberdeen Proving Ground, Md.. June 3, 1920, by D. Mc- 

 Xeal ; Daytime Wind Turbulence in a INIountain Valley (illus. ), by li. M. Varney ; 

 A Fi)g Phenomenon of San Francisco Bay (illus.), by P>. M. Varney; Measure- 

 ments of Solar Iladiation at Madison, Wis., with the Callendar Pyrheliometer 

 (illus.), by E. K. Miller; Some Characteristics of the Calicndar PyrheliDmeter 

 (illu.s. ), by E. II. IMlllcr; Suggestions Concerning Dr. C. (I. Abbot's Program for 

 Four World Observatories for the Observation of Extraterrestrial Solar Radia- 

 tion (illus.), by C. Dorno ; A Waterspout in the Adirondacks; Tornado in Union 

 County. X. C, June 20, 1920, by G. S. Liudgren ; Tornado in Southeastern Wyo- 

 ming, June 24, 1920 ; and Cold Shore Water Owing to OfC-Shore Winds, by C. F. 

 Brooks. 



.Meteorological observations at the Massachusetts Agricultural Experi- 

 ment Station, J. E. Ostii.\ndi:r and G. E. Lixdskog {Massachufietts f^ta. Met. 

 II Ills. STJ-S'^iO (1920), PI), .'f each). — Summaries of observations at Amherst, 

 .Mass., on pressure, temperature, liumidity. precipitation, wind, sunshine, cloudi- 

 ne.ss, and casual phenomena during July and August, 1920, are presented. The 

 ilata are brietiy discussed in general notes on tlie weather of each month. 



SOILS— FERTILIZERS. 



Productive soils, W. W. Wi:ii{ {riiilfulclphid and Loudon: J. B. Lippincott 

 Co., {1!)20). pp. XVI+SDS, ])ls. 2, fujs. 2S3).—li is the purpose of this book to 

 give definite, practical, and complete infonnatioii concerning soils and proHt- 

 able crop production. It is divided into the following sections : Soils, their 

 origin and classification; soils from a chemical point of view; soil and plant 

 relations; crop production; factors determining soil fertility; crop production 

 affected by systems of cropping; application of principles to management of 

 special soils; principles of soil fertility applied to the farm as a whole; and 

 other points on soil management. 



Agricultural geology, F. V. Emkhson (Neio York: Jolni Wiley d Sons, Inc., 

 1920, pp. XVIlI+319, figs. 27i).— This book deals primarily with the origin of 

 soils, and, to a less extent, with the origin of mineral fertilizers. It contains 

 tiie following chapters: Minerals; rocks; weathering; residual soils from 

 various rocks; wind work and eolian soils; ground w'ater ; streams and their 

 work, alluvial soils; classes of alluvial deposits; soil creep, colluvial soils; 

 glaciers and glaciation, glacial soils; lakes and swamps, lacustrine and cumulose 

 soils, lakes, lacustrine soils; oceans; mineral fertilizers; soil regions of the 

 I'niled States; and historical geology. 



.Soil survey of Kent County, Del., .7. E. Dunn, J. M. Snydeis, and E. Hok- 

 KK( ki;k (f;. .'>•. Dcpt. Afjr., Adv. Sheets Field Oper. liur. Soils, 1918, pp. 32, fig. 1, 

 map 1). — Tills survey, made in cooperation with the Delaware Experiment Sta- 

 tion, deals with the soils of an area of 380,160 acres in central Delaware, which 

 lies in the Atlantic Coastal Plain, and has a flat to slightly undulating topog- 

 i-aphy. As a whole, the drainage of the eastern and western parts is poor, 

 while that of the central belt is good. 



The .soils are of sedimentary origin. Including tidal marsh, swamp, meadow, 

 and coastal beach, 17 soil types of 4 series are tnapped, of which the Sassa- 

 fras sandy loam covers 2S.9 per cent, the Elkton sandy loam Vii.~) per cent, and 

 tidal marsh 12 per cent of the area. The Sassafras series covers about half of 

 the entire area. 



Soil survey of St. Johns County, Fla., A. E. Taylor, G. B. Jones, E. C. 

 IIai.i.. and C. N. Mooney (C/. S. Dcpt. Agr., .\dv. Sheets Field Oper. Bur. Soils, 

 1917, pp. 31, pis. 3, fig. 1, map 1). — This survey deals with the soils of an area 

 of 388,480 acres in northeastern Florida, the surface of whi(h consists of an 



