1919] SOILS — FERTILIZKRS. 19 



indicate in general that fr6sts cease In the spring about April 1 helow 4,000 

 ft, about May 1 below 6,000 ft, and by June 1 below 8,000 ft. "The San Juan 

 Basin, however, will be found to be somewhat later; and. On the other hand, 

 many of the mountain valleys will be earlier than their altitude would in- 

 dicate." 



Agricultural meteorology, J. W. Smith [Proc. Ohio Acad. Sci., 6 (WIG), No. 

 5, pp. 239-264, flffs. 5). — Agricultural meteorology is defined, and observations 

 and Investigations which may he classed in the subject are reviewed. The 

 critical periods of plan! growth and the relation of temperature and moisture, 

 especially to the growth of corn, wheat, and potatoes, are discussed, a few 

 of the problems Deeding Investigation are enumerated, and the value of a service 

 to Investigate such problems is briefly explained. 



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

 Weatht r Hur. Climat. Data, 5 (W18), Nos. 5. pp. 207, pis. 4, figs. 2; 6, pp. 206, pis. 

 4. fliis. 2). — These volumes contain brief summaries and detailed tabular state- 

 ments of climatological data for each State for May and June, 1918, re- 

 spectively. 



Free-air data at Drexel Aerological Station, July to December, 1917. W. It. 

 Gregg (U. 8. Mo. Weather Rev. Sup. 11 (WIS), pp. 108, pis. 6).— This records 

 in detail data obtained in 256 observations at an average altitude of 2,9!)1 

 meters. 



[Observations on aerology] (U. S. Mo. Weather Rev. Sup. 12 (1918), pp. 82, 

 p/.s'. 5, fig. l). — This supplement contains the following articles: Free-air Data 

 at Drexel, Nebr'., and Ellendale. N. Dak., Aerological Stations, January to 

 March, 1918, inclusive, and Free-air Temperatures During the Cold Winter of 

 1917-18, by W. It. Gregg; and The Ellendale Aerological Station, by V. E. .laid. 



Meteorological summary, 1916 (Oklahoma Sta. Rpt. 1917, p. 40). — This is 

 a condensed tabular summary of observations at Stillwater, Okla., on temper- 

 ature, precipitation, cloudiness, and wind for each month and for the year. 



Annual report of the [Philippine] Weather Bureau, 1916 (Ann. Rpt. 

 [Philippine] Weather Bur., 1916, pt. 1-2, pp. 144)- — This contains a report of 

 the work of the weather bureau and a record of hourly meteorological observa- 

 tions made at the central observatory of Manilla during the calendar year 

 1916. 



Substances dissolved in rain and snow, V. C. Shippke and Lucia FoRnvcK 

 (Clum. Xcirs, 117 (1918), No. 3058, pp. 322, 323).— Continuing previous work of 

 Peck (E. S. R., 38, p. 416), analyses were made of 41 different precipitations, 

 28 of rain and 13 of snow, that fell between September 29, 1917, and June 1, 

 191S, the total precipitation for the period being the equivalent of 17.9 in. of 

 rain. 



The data are considered insufficient to establish any relation between length 

 of time between precipitations and the amount of dissolved substances or be- 

 tween electrical disturbances and the amount of nitrates present. Sulphates 

 were found to be most abundant during the winter, but this is considered de- 

 pendent upon the amount of coal consumed in the community. Phosphates 

 were found to be present but no carbon dioxid. 



SOILS— FERTILIZERS. 



Soils of southern New Jersey and their uses, J. A. Bonsteel (U. 8. Dcpt. 

 Agr. Bui. G77 (191S), pp. 78, pis. 6, figs. 27).— The author discusses in detail the 

 adaptation of cropping and agricultural systems to local soil conditions in an 

 area of 'J.S33.S40 acres situated in southern New Jersey, embracing Monmouth, 

 Ocean, Burlington, Camden, Atlantic, Gloucester, Salem, Cumberland, and 



