METEOROLOGY. 19 



Chemistiy of pine oil, M. Toch {Jour. Indus, and Engin. Chem., 6 (1914), 

 No. 9, pp. 720-723, fig. 1). — ^A discussion of the various uses to which pine oil 

 can be put and its production and chemistry. Analyses are included. 



METEOROLOGY. 



Agricultural meteorology, F. E. de A. Figueiredo {Rev. Agron. [Portugal], 

 10 {191 ff). No. 5-8, pp. 24I-247, fig. 1). — The observations which are especially 

 needed from the ayricnltural standpoint are indicated. 



Terrestrial temperature and solar changes, E. Huntington {Bui. Amer. 

 Geogr. Soc, 47 {1915), No. 3, pp. 184-189, figs. 2).— This is a critical review of 

 Koppen's views regarding the relation of temperature changes to the sun-spot 

 cycle and Arctowski's pleion and antipleion theory of temperature variations 

 (E. S. R., 31, p. 717). 



The formation of ozone in the upper atmosphere, and its influence on the 

 optical properties of the sky, J. N. Pring {Sci. Prog. Twentieth Cent., 9 {1915), 

 No. 35, pp. 448-470, figs. 2). — This article discusses some factors which deter- 

 mine the optical properties of the atmosphere, chemical determination of con- 

 stituents of the atmosphere, the action of ultraviolet light on air, the deter- 

 mination of ozone in the atmosphere at high altitudes, and the influence of 

 ozone on the nature of light from the sky. 



It is stated that " the optical properties of the atmosphere must lie in the 

 precise determination of the presence of such bodies as ozone, hydrogen peroxid, 

 and nitrogen peroxid," and methods for such determinations are described. 

 Although the methods used were designed to detect very minute amounts of 

 tlie substances named, they failed to show the presence of appreciable amounts 

 of oxids of nitrogen or hydrogen peroxid resulting from the action of ultra- 

 violet light on air, and they also failed to show the presence of detectable 

 amounts of these substances in the air from high altitudes. 



While the tests do not preclude the possibility of the formation of these 

 substances they show that the quantity formed is negligibly small when com- 

 pared with ozone. 



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

 Weather Bur. Climat. Data, 2 {1915), Nos. 1, pp. 246, pU. 2, figs. 7; 2, pp. 234, 

 pis. 2, figs. 7). — These volumes contain, respectively, brief summaries and de- 

 tailed tabular stiitements of climatological data for each State for January and 

 February, 1915. 



Meteorological observations, J. S. Stevens {Maine Sta. Bui. 234 {1914), 

 pp. 295, 296). — A monthly and annual summary of observations at the University 

 of Maine on temperature, precipitation, cloudiness, and wind movement during 

 1914 is given. The mean temperature for the year was 43.35° F., as compared 

 with an average of 42.66° for 40 years; the precipitation was 35.04 in., as 

 compared with an average annual precipitation of 42.75 in. for 46 years; the 

 snowfall was 66.5 in., as compared with 88.19 in. as the average of 46 years; 

 the number of clear days was 2()4 ; the number of cloudy days 97 ; the niimber 

 of rainy days was 78; and the total movement of wind was 48,809 miles. 



Salton Sea water, A. E. Vinson and C. N. Catlin {Arizona Sta. Rpt. 1914, 

 pp. 364-366). — This is the eighth annual report on the composition of Salton 

 Sea water (E. S. II., 32, p. 511), comparing analyses of samples collected June 

 12, 1914, with previous analyses. 



During the 359 days from June 18, 1913, to June 12, 1914, the total solids 

 increased from 1,002.56 to 1,179.6 parts per 100,000, an increase of 17.5 per cent. 

 The construction of the total saline matter has been fairly regular during each 



