1020 EXPERIMENT STATION RECORD. 



" It is found that the evaporation runs from 1 to 2 in. per month during the winter. 

 The evaporation during the night is practically as rapid as during the day. 



"An attempt was made to obtain a formula from the observations of 1889 and with 

 enough success to compute the evaporation in 1890 from May to October with a 

 difference of less than half an inch. The formula was as follows : 



"E=.39 (T — t) (1 + .02W). 



"E represents the evaporation in inches in 24 hours. 



" T is the vapor tension corresponding to the temperature of the surface of the 

 water. 



"t is the vapor tension corresponding to the temperature of the dew-point at that 

 time. 



" W represents the number of miles of wind in the 24 hours. 



" Observations have since been made to obtain a more perfect formula, but are not 

 yet reduced." 



Elementary treatise on meteorology, A. Angot (Traits elcmentaire de metcorologie. 

 Paris: Gauthier-Villars, 1899, pp. VI+412; rev. in Nature, 59 {1899), No. 1535, pp. 505, 

 50G). 



Instructions for voluntary observers, W. L. Moore (U. S. Dept. Agr., Weather 

 Bureau Doe. 184, pp. 23, figs, 9). — This coutains brief instructions for the guidance of 

 voluntary observers in taking and recording observations, more especially of tem- 

 perature and rainfall. 



Meteorological record for 1897 {New York State Sta. Bpt. 1S97, pp. 619-627).— 

 Tabulated daily and monthly summaries of observations on temperature and 

 monthly summaries of observations on precipitation for the period from 1882 to 1897. 



Report of the meteorologist, A. M. Hildebrandt {Texas Sta. Bpt. 1898, pp. 1134- 

 1136, charts 5). — Tabulated monthly summaries of observations at the station on tem- 

 perature (1897) and precipitation (1891-1897). Charts show graphically the daily 

 and mean annual rainfall for 1891 to 1897. 



The rainfall of the globe, W. Ule (Bev. Sci. [Paris], 4. ser., 11 {1899), No. 13, 

 p. 412). — The mean rainfall of the different grand divisions of the earth is given and 

 discussed. 



Extraordinary hailstorms, G. de Rocquegny-Adanson {Per. Sci. Bourbonnais, 12 

 {1S99), No. 135, pp. 62-67). — Brief accounts are given of* some of the more important 

 hailstorms from 1776 to date. 



Sun spots and weather, A. B. MacDowall {Nature, 59 {1899), No. 1533, p. 46?, 

 jifj St 2). — A comparison of the number of warm and dry months since 1841 with sun 

 spots. 



Relation of meteorology to forestry in Michigan, R. C. Kedzie {Michigan Sta. 

 Bui. 162, pp. 18-31).— After stating the relation of meteorology to forestry and forest 

 orowth, relation of soil to moisture, etc., abstracts are given of the meteorological 

 observations covering a period of 34 years, from 1864 to 1897. 



AIR— WATER— SOILS. 



Investigations concerning the influence of the mechanical 

 working of the soil on its fertility, B. Wollny [Forsch. Ayr. Phys. 

 [ Wollny], 20 (1898), Xo. 3, pp. 231-289).— Results of previous work iu this 

 line have been published heretofore (E. S. R., 7, p. 509). In this article 

 the purpose of the experiments is explained and the results are given 

 in tabular form and discussed at some length. The results obtained by 

 other investigators are cited. The subjects discussed are the mechan- 

 ical condition of the soil as affected by stirring, the frequency and time 

 of cultivation, the stirring of the surface soil, the use of the land roller, 

 and bed and level culture. Various crops were grown in connection 

 with the different tests. It was found that all crops grown gave better 



