1919] SOILS — FERTILIZERS. 617 



ments thai ooted abore nmi deals especially with the origin of the dust ; the 

 translocating agents; regions of deposition ; and quantity, appearance, and com- 

 position of the dust. Suggestions arc aisi, made as to the kind of observations 

 on such storms i hiit should i>e recorded. 



Monthly Weather Review (U. 8. Mo. Weather R> v., J,C> 11918), W09. 11, pp. 

 497-448, i>i*. 9, fig*. 12; 12, pp. 549-608, pis. 35, fig*. 8).— In addition to wemther 

 forecasts, river and flood observations, halo phenomena, and selsmologlcal re- 

 ports for November and December, L918; lists of additions to the Weather 

 Bureau Library and of recent papers on meteorology and seismology; notes on 

 the weather of the months; solar and sky radiation measurements at Wash- 

 ington, D. C, during November and December, 1918; condensed Climatologlcal 

 summaries; and the usual climatolOglcal tables and charts, these numbers 

 contain the following articles: 



No. //.—Some Characteristics of the Marvin Pyrheliometer, by P. I>. Foots 

 (Abs.); The Dustfalls i,f March, 1918 (illus.), by A. N. Winched and E. it. 

 Miller (see p. 610); Smoke from Minnesota Forest Fires (illus.), by II. 

 Lyman; Effects of Hurricanes on the Upper-air Currents, by W, EL Pickering; 

 Ocean Temperatures in Long-range Forecasting, by C. F. Brooks ; Ocean Tem- 

 peratures and Seasonal Weather in Southern California, by W. E. Hitter and 

 (J. F. McEwen (extracts)-; King Island Weather: Seasonal Abnormalities in 

 Southern Australia, by C. Richardson (reprinted) ; The Marine Observer's 

 Handbook (Abs.); Definitions of "Mean," "Average," and "Normal," by 

 C. F. Brooks (compilation) ; Frost and the Growing Season, by W. G. Reed 

 (Abs.) (E. S. EL, 4<>, p. 209) ; Hourly Duration of Precipitation at Philadel- 

 phia (illus.), by G. W. Mindling; Rainy Days and Rainfall Probability in the 

 United States, by R. DeC. Ward (Abs.) ; The Ancient Piedmont Route of 

 Northern Mesopotamia, by E. C. Semple (Abs.) ; and Past and Present Climates 

 of Our Leading Crop Plants, by H. C. Cowles (Abs.) (see p. 616). 



Xo. 12. — Halo Observations at York. N. Y., by M. N. Stewart; Lunar Rainbow 

 at Tatoosh Island, Wash., by R. C. Mize; Wind Aloft at Houston, Tex., De- 

 cember 18, 1918 (illus.), by I. R. Tannehill ; How Meterological Instruction 

 may be Furthered by R. DeC Ward; Collegiate Instruction in Meteorology 

 (illus.), by C. F. Brooks; A Signal Corps School of Meteorology, by O. L. Fassig ; 

 New Meteorological Books; Some Recent Contributions to the Physics of the Air, 

 by W. J. Humphreys (extracts) (see p. 616) ; Subjects for Research in Meteor- 

 ology ( see p. 615) ; Notes on Hurricanes of 1918 (Illus.), by C. A. Donuel ; Tropi- 

 cal Cyclone of September 14-17, 1918, in the Pacific Ocean Just Weal of Mex- 

 ico (illus.), by F. G. Tingley ; The Cold Winter of 1917-18 (illus.), by P. C. 

 Day; and Effects of Cold Weather, Winter of 1917-18, on Vegetation, by J. W. 

 Smith. 



Meteorological summary, 1917 (Oklahoma Sla. Rpt. 1918, p. 58). — This is 

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

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



SOILS— FERTILIZERS. 



Soil inoculation with Azotobacter. P. Emkrson {Iowa Zta. Research Bui. 

 45 (1918), pp. 25-64, flO*- 7). — Investigations with eight forms of Azotobacter 

 are described, embracing laboratory and greenhouse pot tests together with ob- 

 servations on the acid extract, amino, nonprotein, and polypeptid nitrogen 

 content of the pot soils. 



The laboratory experiments comprised a study of the effect of transfers 

 made every other day on the nitrogen fixing power of the organisms, of the 

 effect of transfers made once each week in sand cultures variously modified, 



