METEOROLOGY WATER. 



Suininanj of mctcorologivul ohscrvationn, lOOG. 



313 



Barometer (inches): Mean 



Temperature (° F.): 



Mean 



Highest 



Lowest 



Greatest daily range 



Least daily range 



Mean daily relative humidity (per cent) 



Rainfall (inches) 



Number of days on which 0.01 in. or more of rain fell 



Mean percentage of cloudiness 



Number of days on which cloudiness averaged 80 per 

 cent or more. 



Last frost in spring 



First frost in fall 



1906. 



30.049. 



49.5 



90 (June 9 and 30). 



—8 (Feb. 6) 



38 (Oct. 13) 



3 (Oct. 23) 



83.6 



34.15 



141 



5.4 



125 



Growing season 

 (Apr.-Sept.). 



90 (June 9 and 30). 

 23 (Apr. 1). 

 37 (Apr. 26). 



T9.1. 



18.99. 



64. 



5.2. 



48. 



May 29. 

 Nov. 2. 



Meteorological statistics, II. F. Stupart (Irrigation in the Provinces of 

 Alberta and ^askatcheivan, 1906 and 1907. Ottawa: Dept. Int., 1908, pp. 5, 6, 

 28-38). — Observatious on rainfall and temperature at Calgary, Chaplin, Swift 

 Current, Medicine Hat, and Macleod are given for 1906 and previous years, in 

 some cases as far l)aclv as 1S83. 



How much rain does the earth receive annually? (Rev. Sei. [Paris], 5. ser., 

 9 (1908), Xo. 22, pp. 688, 689). — This article briefly summarizes tlie various 

 estimates which have been made on tliis point. The average total annual rain- 

 fall of the earth is placed at 4(ir),000 cu. km., of which 112,000 cu. km. falls on 

 land and 353,000 cu. km. on sea. 



The damag-e done by cyclones (Rev. Sci. [Paris], 5. ser., 9 (1908), No. 19, 

 p. 59.'f). — Statistics of persons killed and buildings destroyed by the principal 

 cyclones from 1722 to 1900 are reported. 



On hail protection appliances, J. Violle (Rev. Sri. [Paris], 5. ser., 9 (1908), 

 No. 11, pp. 3'i6, 3Ji7). — Experiments with explosives discharged from captive 

 balloons are reported, but it is thought that the experiments were too few in 

 number to give conclusive results. It is believed that more extensive and 

 systematic experiments should be made. 



The underground waters of Cape Colony, C. F, Juritz (Agr. Jour. Cape 

 Good Hope, 32 (1908), Nos. 5, pp. 6J.',-6'.}7; 6', pp. 1. ',9-771; 33 (1908), No. 1, 

 pp. 83-98). — A large number of analyses are reported and the character of the 

 waters is discussed. 



Chemical analyses of water from dew ponds, S. Skinner (Nature [London], 

 78 (1908), No. 2011, p. 30). — Determinations of calcium carbonate and chlorin 

 in samples of water from dew ponds in limestone regions as compared with 

 similar determinations in water from a spring near one of the ponds are re- 

 ported to show that the water of the ponds is low in calcium carbonate, thus 

 indicating that the ponds "are simply water butts in which rain water is 

 stored." The influence of the proximity of the sea is shown by a considerable 

 increase in the proportion of chlorin in the water. 



The drinking water supply of cities frora a chemical standpoint, W. 

 Hk.mpel (Umschau, 12 (1908), No. 27, pp. 523-527). — The great importance of 

 a suitable supply of drinking water for cities is pointed out. The author be- 

 lieves that the best results can be obtained by supplying soft water for laundry 

 purposes, steam engines, etc., and hard water derived from deep iniderground 

 sources for drinking purposes. He condemns the use of surface waters for 

 drinking jmrposes. 



