512 EXPERIMENT STATION RECORD. 



i'.re iiiuch more likely to make serious inroads on the crops than are the chilling 

 blasts of April and May." 



Cyclonic distribution of precipitation, J. A. Tdden (Proc. Iowa Acad. Sci., 

 IS {1906), PI). 223-225, pi. i).— From the results obtained by a method de- 

 scribed in an earlier report (E. S, R.. 17, ]). nrsi ) the following conclusions are 

 drawn : 



" (1) Tliat the area of greatest precipitation is not the same for different 

 stations. They suggest that the cyclonic distribution of precipitation bears a 

 definite i*elation to climate, and varies with this. 



" (2) That if the area of greatest precipitation is to the southeast of the 

 center of cyclones in the Upper Mississippi Valley (as taken for granted 

 hitherto in general works on American meteorology) there must be a Aery 

 marked diurnal shifting of this area concerning which nothing is as yet known ; 

 for to make up for the deficiency of precipitation in this part of the composite 

 cyclone of the morning hour there would have to be a corresponding excess 

 during some other part of the day. 



" (3) That in either case the variations in the location of this area of great- 

 est precipitation, be they local or diurnal, are quite probably of sufficient mag- 

 nitude to appreciably affect the accuracy of weather forecasts." 



The influence of precipitation on the yield and quality of crops, W. 

 SCHNEIDEWIND KT AL. {Luiulic. Jaktb., 36 (1901), 'So. .'/, pp. o7-'i-5Sl, pi. 1). — 

 Observations during the period 189G to 1906 on the influence of precipitation 

 on (1) the yield of crops in general, {'!) the yield of individual crops, and (3) 

 the quality of the crops, are summarized and discussed. 



The observations show that in dry years with lower yields the seed crops 

 were richer in protein and the root croi)S richer in carboh.tdrates and protein 

 than in wet years and thus that the net outcome is not so small as the gross 

 results would indicate. High-l)red resistant .sugar beets showed less variation 

 in dry and wet years than common varieties. The high-protein barley grown 

 in dry years is less valuable for brewing than lower protein barley. 



Forests and rainfall in West Prussia and Posen and the influence of wind 

 on rain and snow measurements, J. Schubert {Ztschr. Forst u. Jagdw., 38 

 {1906), Xo. 11, pi>. 7 28^7 3.3, pgs. ', ; ahs. in Hcicncc, n. set:, 26 {1907), No. 668, 

 p. 518). — A critical studj'. 



Man's influence on climate, T. R. Sim (Natal Agr. Jour, and Min. Rec, 

 10 (7.907), yo. 7, PI). 7 17-72 'i). — This article discusses local influence on climate 

 due to building of structures of various kinds, drainage, and the smoke and 

 fumes of manufacturing establishments, but more particularly the wider influ- 

 ence exerted by the maintenance or destruction of vegetation on the surface of 

 the earth. 



Protection of buildings from lightning, A. R. Sawyer and L. J. Smith 

 (Michigan Sta. Bill. 2.'i9, pp. 17-35. fig>i. 5). — This bulletin gives rules for the 

 erection of lightning conductors, as issued by the Lightning Rod Conference in 

 1882, with observations thereon by the Lightning Research Committee, 1905, 

 and describes the system of lightning i)rotec-tion used on the college barns, 

 with details of its construction. 



River discharge, J. C Hoyt and N. C. Grover (New York and London, 1907, 

 pp. VIII -\- 136, pis. 7, figs. 2Jf). — This book attempts to bring together from all 

 available sources information in regard to the best practice, in suitable form 

 for the use of students and engineers. " Much new matter is also presented, 

 especiallj' the descriptions of the conditions necessary for good gaging stations 

 at which mejisurements of discharge may be made either by weir, current 

 meters, floats, or slope; the routine of the selection, establishment, and main- 

 tenance of gaging stations ; the details of the field work of discharge measure- 



