238 EXPERIMENT STATION RECORD. 



Meteorological observations in Sweden, 1902, II. Iv. Hamberg [Meteor. Takttag. 

 Sr, rigt [Observ. MiUor. Suidoises'], K. Sr, nska Velensk. Akad., 44 I 1902), pp. X !-'•; i. 

 This is one of the series of reports of meteorological observations made under tin- 

 direction of the Central Meteorological Institute and published by the Royal Academy 

 of Sciences of Sweden. 



It includes summaries of daily observations at L8 stations of the second order, 

 monthly and annual summaries, general observations for .'!'•> stations of the second 

 order, the latter being also summarized in five-day periods. The results of observa- 

 tions on temperature alone are reported from 89 stations of the third order. The 

 location, altitude, etc., of the stations are given, and some of the apparatus used and 

 the methods of calculating results are described. 



Observations on the mean distribution of rainfall in the Department of 

 Gironde, G. Rayet ( Mem. Soc. Sci. Phys. et Nat. Bord\ aux, 6. ser., 3 i 1903 l, pp. 37-51, 

 chart J). — Observations at different places (1892-1901) are summarized. 



Rainfall in the Duff development concession during 1903, J. D. Gimlette 

 and M. E. Scriyen (Ayr. Bui. Straits and Federated Malay stairs, 3 (1904), I, No. 6, 

 p. 235). — The monthly rainfall and the greatest rainfall during 24 hours are given 

 for the period of May to December, inclusive. 



Rainfall measurements in Usambara, C. Uhlig (Ber. Land. u. Forstw. Deutsch- 

 Ostafrika, 1 (1903), No. 7, pp. 467-563, dgm. 1).— The literature of meteorological 

 observations in German East Africa is reviewed and all available measurements of 

 rainfall are summarized and discussed. 



Requirements of productive trees which can grow in arid countries with- 

 out summer irrigation, P. Gennadiis {Cyprus Jour., 1 (1904), No. 1, pp. 6, 7). — 

 A summary is given of rainfall observations at 6 stations in the Island of Cyprus 

 during the years 1881-2 to 1901-2. The average rainfall of the Island during the 

 period was 17.45 in. 



AIR— WATER— SOILS. 



On the formaldehyde of the air, H. Hexriet ( Compt. Rend. Acad. Sci. P.aris, 

 139 (1904), No. 1, pp. 67, 68). — Replying to (iautier's statement that air containing 

 as much formaldehyde (2 to 6 gm. per 100 cubic meters of air) as the author reported 

 in a previous paper would not be respirable, the author discusses the possibility of the 

 presence of a polymer of formaldehyde in the air which yields the latter under the 

 conditions of the method used in determining formaldehyde. 



Observations at the Franco-Scandinavian station for exploration of the air 

 at Hald (Compt. Rend. Acad. Sci. Paris, 138 (1904), No. 26, pp. 1736-1737) .—A 

 brief account of observations by means of kites and balloons. 



A method of destroying- or preventing the growth of algae and certain 

 pathogenic bacteria in water supplies, G. T. Moore and K. F. Kelleeman ( V. S. 

 Dept. Agr., Bureau of Plant Industry Bid. 64, pp. 44)- — Tins bulletin records the results 

 of investigations begun in 1901, and which have included microscopic examinations 

 of water with reference to nature and distribution of objectionable algteand methods 

 of removing them and studies of the effect of copper sulphate, colloidal copper, and 

 other disinfectants on algee and pathogenic bacteria. The nature and scope of the 

 investigations and of the results reported are indicated in the following summary: 



"The disagreeable odors and tastes so often present in drinking water are due 

 almost exclusively to alga?, although the economic importance of studying these plants 

 has not been recognized until recent years. 



"These algal forms are widely distributed, and reservoirs in many States have 

 been rendered unfit for use by their presence. 



"The methods now known for preventing or removing the odors and tastes caused 

 by algae have proved unsatisfactory, either because of prohibitive expense or failure 

 to accomplish result. 



