1112 EXPEElMENt STATlOK EEOORD. 



analysis of feeding stuff's. The iiublie-ation contains introductory material by 

 M. Gresboff. 



Chemicals and allied products {Bur, of the Census [U. iS'.] Bui. 92, pp. 

 124). — Among the topics discussed in this publication are several of agricul- 

 tural interest, including potashes, wood distillation, fertilizers, tanning ma- 

 terials, paints, and varnishes. 



Sugar chemistry, E. O. von Lippman (Deut. Zuclcerindus., 33 (1908), Nos. 6, 

 BcUage 1, pp. I'tl-lo.',; 7, BeUage 1, pit. 112-11'.',; .S, Beihige 1, pp. 201, 202).— A 

 review of the most important work in this field appearing in the second half 

 of 1907. 



METEOROLOGY— WATER. 



studies on the phenomena of the evaporation of water over lakes and 

 reservoirs, F. H. Bigelow (J/o. Weather Her., 35 {1901), No. 1, pp. 311-316; 

 36 {190S), No. 2, pp. 2.'i-39, flgs. 15). — The article explains the need for investi- 

 gation of evaporation as well as the availability of Saltou ^^ea for such investi- 

 gations. The proposed plan and method of the investigation are also described 

 in some detail, with discussion of theoretical considerations entering into the 

 problem, an.d a report of preliminary studies made at Reno, Nov., to obtain 

 •■ a more intelligent view of the problem." By means of instruments and evap- 

 orating pans placed on rafts in the Keno reservoir and at different heights on 

 towers in its innuediate vicinity records were made of the temperature, vapor 

 l»ressure, and rate of evaporation. 



The results throw some light on the cause of discrepancies between results of 

 observations of other investigators on evaporation. For example, " they show 

 clearly that the location of the pans relative to the water of a reservoir is of 

 jirimar.v importance in measuring the total amount of evaporation, and that 

 fibservations on a pan away from the water can not be transferred to the water 

 surface itself except with the utmost caution." 



The need of self-registering apparatus for studies of this kind was very 

 clearly shown. 



It was found in these investigations that " if a measure of the height of the 

 water in the pan be made at 7.30 a. m., and another at 10.30 a. m., th«' difference 

 multiplied by S^vvill be closely the total evaporation for the day. This rule 

 holds at Reno, Nev., during^the summer, but it should be verified in other locali- 

 ties. Furthermore, in the arid regions of the West it seems probable that a lake 

 or reservoir evapoi-ates about five-eighths as fast as an isolated pan placed out- 

 side the vapcu' blanket; in other words, this vapor blanket seems to conserve 

 about three-eighths of the water that would otherwise be lost by the evap- 

 oi'ation. 



" It is important that similar ex])eriments with towers be made in the central 

 and eastern portions of the United States, in the prevailing damp climates, to 

 discover whether similar rules can be applied In practice." 



Monthly Weather Review {Mo. Weather Rev., 36 {1908), Nos. 1, pp. 1-16, 

 ch'.irts 8; 2, pp. 11-50, figs. 15, charts 19). — In addition to the usual reports on 

 forecasts, warnings, weather and crop conditions, meteorological tables and 

 cliarts for the months of January and February, IDOS, recent papers bearing on 

 meteorology and seismolog.v, recent additions to the Weather Bureau library, 

 etc., these numbers contain the following articles and notes : 



^'o, 1 — Biographical note on Mr. Frank Ridgway; and No. 2 — Biographical 

 note on Mr. Thomas S. Collins, and Studies on the Phenomena of the Evapora- 

 tion of Water over Lakes and Reservoirs (illus.), by F. H. Bigelow. (See 

 above.) 



