1918.] SOILS FERTILISERS. 511 



at Different Temperatures, by J. Moran ; Absorption Bands of Atmospheric 

 Ozone in tlie Spectra of Sun and Stars, by A. Fowler and A. J. Strutt; Some 

 Temperature Correlations in the United States (illus.), by T. A. Blair (see 

 p. 509) ; Rainfall and Gunfire, by A. Angot ; Bird Migration in Central Switzer- 

 land in Relation to Meteorological Conditions, by K. Bretscher ; Some Nuclei 

 of Cloudy Condensation, by J. Altken ; Condensation and Evaporation of Gas 

 Molecules, by I. Langmuir ; Computation and Measurement of the Complex 

 Molecules of Some Vapors. According to the New Condensation Theory, by 

 L. Andr6n ; A New Evaporation Formula, by R. E. Horton ; Forests and Rain- 

 fall Experiments (see p. 510) ; Excessive Precipitation in London, England, 

 by H. R. Mill; Greatest 24-hour Rainfall at Washington, D. C. ; Revolving 

 Fluid in the Atmosphere, by N. Shaw ; Motion of a Particle on the Surface of 

 a Smooth Rotating Globe, by F. J. W. Whipple; Motion of the Air in the 

 Lowest Layers of the Atmosphere, by G. Hellmann ; The Relation Between 

 Pi'essure-gradient, Wind, and Friction in Steady Motion, by F. Akerblom; 

 The Formation of Anticyclonic Stratus, by C. K. M. Douglas; Windward 

 Islands v. Leeward Islands (illus.) ; and Canadian Astronomical Appointments. 



No. 10. — Atmospheric Optical Disturbances, Fall of 1911 to February, 1917, 

 by C. Dorno ; Transparency of the Atmosphere for Ultra-violet Radiation, by 

 R. J. Strutt; A. Brester's Theory of the San; Lunar Rainbow, by H. A. French; 

 Halos of October 3, 1917, in Texas and Ohio (illus.) ; Device for Observing 

 Radiants of Auroras; Notes on the Climate of France and Belgium (illus.), 

 by P. O. Day (see below) ; Fog Along the California Coast (illus.), by A. H. 

 Palmer; Relative Frequency of Fog at United States Lighthouses; Glaze, 

 " Glazed roads," "Ammil " ; Great Thunderstorm of August 1, 1917, in Trinity 

 County, Cal. ; Heaviest Rainfall in the British Isles ; Influence of Weather 

 Conditions on the Auiounts of Nitrogen Acids in the Rainfall and Atmosphere 

 in Australia, O. Masson (see p. 509) ; Lunar Period in the Rates of Evaporation 

 and Rainfall, by J. R. Sutton (see p. 510); John West James, 183S-1917; 

 Tropical Hurricane of September 27-28, 1917, in Southeastern Louisiana 

 (illus), by R. A. Dyke; and Annual Rise of the Columbia River, 1917 (illus.), 

 by E. M. Keyser. 



Notes on the climate of France and Belg'ium, P. C. Day (U. S. Mo. Weather 

 Rev., 45 (1911), No. 10, pp. 487-^96, figs. 7).— The climatic conditions are quite 

 fully discussed, especially from the standpoint of bodily comfort. 



SOILS— FEETILIZERS. 



Soil acidity and the hydrolytic ratio in soils, C. H. Spxtrway (U. S. Dept. 

 Agr., Jour. Agr. Research, 11 {1911), No. 12, pp. 659-672).— This article reports 

 investigations made at the Michigan Experiment Station, the results of which 

 are summarized as follows: 



"A definite relationship was found between the ratios of calcium to iron and 

 aluminum soluble in fifth-normal hydrochloric acid and the soil reaction. All 

 the acid soils have ratios CaO: (FezOa+AhOa) above 1:1.3, and all the alka- 

 line soils have ratios below this figure. It is believed that the reactions of the 

 soils studied depend chiefly upon the hydrolytic ratios existing between hydro- 

 lyzing compounds of the alkali earths and iron and aluminum. 



"A method for determining the calcium oxid required to neutralize a soil 

 by indirect titration is described in which certain fixed quantities of a stand- 

 ardized calcium hydroxid solution are allowed to react separately with varying 

 amounts of soil. The concentrations of soil and solution giving a neutral 

 reaction are chosen from the series by comparing the electrical resistance of 



