91 '2 EXPERIMENT STATION RECORD. 



iii((i (lio soil, so that sullicicut iiioisture is lirou^^lit ii]) fioin lu-low to satisfy tlu» 

 ik'Uiaiuls of the plant latci- in tlit' season, wlien the weather is dry and sunshine 

 prevails. The temperature dnrilif,' June and .luly is also a very inii>ortant faelor. 

 averajiinu about 78° for the former month and 80° for the latter. There is a 

 marlied uniformity in tlii' averajje temperature amonj? all the States in the 

 eotton belt." 



When the bolls beyin to ojien (in August) "an abundance of lij^ht, well dis- 

 tributed showers and warm sunshine is needed. If too much rain falls, the 

 results are peculiarly disastrous; the weed will befjin to grow rapidly, to the 

 detriment of the fruit ; the plant will cease to make new blooms and the .scpiares 

 .already formed will drop; the bolls will decay on account of the accuninl.ated 

 moisture which they absorb; the fiber iu the open bolls will be either beaten 

 out or discolored. 



" September and October are the months for picking;, and, of course, dry 

 weather is needed. Only sutlicieut moisture is then required to nourish the 

 growing bolls and opening flowei'S, and much of this can be secured through the 

 roots, provided the weather early in the season has been such as to cause the 

 roots to i)enetrate deep into the soil. Under normal conditions the rainfall is 

 very light during the months of September and October throughout the major 

 portion of the cotton belt, affording line opportunity for securing the matured 

 eroj)." 



An analysis is given of weather conditions during years of greatest yield. 



Periodical variations in climate, G. Mf.yer {(Jaca, .'//f (1908), No. 10, pp. 

 ,588-591). — This article attempts to show whether there is a relation between 

 tlie moon and the weather. The general conclusion reached is that the phases 

 of the moon have a greater and more certain influence iipon variations in 

 climate than the appearance of sunspots, at least for the region covered by the 

 study reported. 



Study of the results of hail shooting, L. OoniNOT {Aun. ^oc. Agr. >SVi. ct 

 Indus. T.i/dii, imn'. pp. S.i~92). — This is a review of the i)resent status of this 

 subject based mainly upon official reports of government commissions ainiointed 

 to investigate the matter. 



Atmospheric humidity charts, A. Frohlich (Gsndht.'i. Ingen., 31 (1908), 

 Xo. '>0, pp. 790-792, cliart.^ 3). — Charts showing the atmospheric humidity corre- 

 si)onding to different temi>eratures from — 20 to 100° C. are given. 



Report of the Chief of the Weather Bureau, 1906-7 (U. S. Drpl. Agr., 

 Wnitlirr Bur. Rpf. VJOC-l, pp. XLI II +-',02).— Ai> usual, i)art 1 of this docu- 

 ment consists of an administrative report reviewing the operations of the 

 Weatlier liureau during the year and including statements regarding additions 

 to eiiuipment and extension of the work; part 2 gives a list of observing stations 

 and changes therein during inOG, and twice-daily observations for 29 selected 

 stations during 1906 ; part 3, monthly and annual meteorological summaries for 

 189 stations; part 4, monthly and annual means and annual extremes of tem- 

 perature and dates of first and last killing frosts, 1906; part .5, monthly and 

 annual precipitation, 1906, and monthly and seascmal snowfall, 1906-7; and 

 part 6, miscellaneous meteorological tables and reports. 



Among the more imi)ortant subjects receiving attention during the year were 

 research at AIouTit Weather, more particularly with reference to upper air in- 

 vestigations by means of kites, solar radiation, solar physics, and magnetism; 

 forecasts and warnings; seismological observations; investigation of evai)ora- 

 tion in connecticm with the Salton Sea (E. S. R., 19, p. 1112) ; river and flood 

 service; climatological service; ocean meteorology; and wireless telegraphic 

 weather service. 



