816 EXPERIMENT STATION RECORD. 



'h fW^- 2). — Theso papers, like the preeeilin.LC mniibers in tlie same series, 

 contain information similar to tliat publislied in previous years under the title 

 Kei)()rt of Progress of Stream Measurements, and include not only records of 

 flow of streams in tlie areas named, but data regarding precipitation, evapora- 

 tion, water power, and river profiles, as well as " the results of computations 

 based on these data, and other infoimation that has a direct bearing on the 

 subject, such as descriptions of basins and the streams draining them, utility of 

 the water resources, etc." 



Geolog'y and ■water resources of a portion of the Missouri River Valley 

 in northeastern Nebraska, G. E. Condra (//. »S'. GeoL kSurvey, Watcr-Suiiplj/ 

 I'apcr No. 215, ini. 59, pis. 11). — "The region considered in this report lies in 

 northeastern ^Nebraska, south of Missouri River, and extends about 150 miles 

 east and west and approximately 2D miles north and south. The total area is 

 over 4,100 square miles, comprising Dakota, Cedar, Knox, and Boyd counties 

 and the northern part of Holt County." 



The report gives the results of field studies during the summer of 1903 on 

 topography and geology, including especially mineral resources, surface and 

 underground water resources in general and in detail for each county, besides 

 brief notes on soils, crops, stock raising and dairying, and timber resources. 



"The soils of the region are of se\eral types, having been formed by various 

 agencies acting on rocks of different kinds; most of them are closely related to 

 the underlying formations. Much of the eastern and central parts of the area 

 lies in the fertile loess region where the soil is deep and easily worked, receives 

 and holds moisture well, and yields heavy crops on both hilly and level lands. 

 The alluvial bottom-land or flood-plain soil is also fertile and easily tilled, but 

 in the lowest areas fields are often damaged by high waters and by shifting of 

 the river channel. The heavy Pierre clay, or gumbo soil, is especially extensive 

 in Boyd County; it contains some alkali and often affords bad water, but 

 usually produces good grass and heavy yields of corn, oats, and wheat, especially 

 where the clay is mixed with sand. The sa,ndy upland soils in Cedar, Knox, 

 Holt, and western Boyd counties stand droughts well and are gradually being 

 utilized." 



Geolog-y and water resources of the Republican River Valley and adja- 

 cent areas, Nebraska, G. E. Condra (U. .S'. GcoL Siiri'cy, Wafrr-Siipiilt/ iintl 

 Irrig. I'apcr No. 216, pp. 11, pis. 13, figs. 3). — This report deals with a portion of 

 southern Nebraska 22J miles wide and 272* miles long, comprising an area of 

 about 0,1!)0 square miles and including the greater part of 10 counties, which 

 are, from east to west, Jefferson, Thayer, Nuckolls, Webster, Franklin, Harlan, 

 Furnas, liedwillow, Hitchcock, and Dundy. These counties lie along the Kansas 

 border, extending from the vicinity of Fairbury westward to the Colorado State 

 line. The report is the result of general observations made during several 

 consecutive seasons and of special field studies during the summer of 1904. 



The topography, drainage, and climate are briefly discussed, and the geology 

 and water I'esonrces are treated in detail. The agricultural resources (soils, 

 crops, stock raising and dairying, and timber) also receive some attention. 



From the average annual rainfall at S stations a diagram was i)lattod which 

 shows the rather gradual decline of rainfall from about 30 in. on the eastern 

 boundary to less than 20 in. on the western. 



It is shown that in general the area " is underlain by various formations 

 of cretaceous age lying unconformably on carboniferous formations and exten- 

 sively overlain by tertiary and quaternary deposits. Originally the latter cov- 

 ered the entire sui'face, but they have now been removed in the deeper valleys." 



Detailed data regarding the water supply from surface and underground 

 sources are given for the area as a whole and for each county. The supply of 



