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Numerous ground‐water hydrologists have obtained records of water‐level surges in wells during earthquakes and of heightened or lowered levels after those earthquakes. Many of these surges and changes of level are undoubtedly direct effects of the several earthquake‐waves that are recorded on seismographs. Thus, water‐level recorders on observation‐wells promise to afford a means of extending grea

The membership of the Committee during the past year has continued as it was a year ago [see Trans. Amer. Geophys. Union, p. 433, 1940].During a large part of the year, particularly during the last few months, many of the members of the Committee have been engaged in activities more or less closely related to defense. As a consequence it has been necessary to omit or postpone some research studies

The Houston District, as the term is used in this paper, comprises an area between the Trinity and Brazos rivers in Harris County and parts of Montgomery, Waller, and Fort Bend counties, Texas. It consists of a plain of low relief that lies not far above sea‐level, and is a part of the West Gulf Coastal Plain. A part of the District is shown in Figure 1.Large quantities of ground‐water are pumped

The Pecos River Drainage‐Basin is underlain by a thick series of Permian rocks consisting largely of limestone, gypsum (or anhydrite), and halite. The beds have a regional eastward or southeastward dip of 40 to 80 feet to the mile and successively younger beds are exposed at the surface from west to east across the Basin (Fig, 1). The beds of the San Andres formation and the Chalk Bluff formation

Ground‐water dams are recognized in the unconsolidated sediments of two intermontane valleys in southwestern Utah. Parowan Valley is about 30 miles long and has a general northeasterly trend; Cedar City Valley lies west and south of Parowan Valley, is somewhat larger, and has a more nearly north‐south trend. Great accumulations of boulders, gravel, sand, and clay have been brought into both valley

The personnel of the Committee is now as follows: Harry Fielding Reid, Professor Emeritus of Geology, Johns Hopkins University, 608 Cathedral Street, Baltimore, Maryland; William H. Hobbs, Professor Emeritus of Geology, University of Michigan, Ann Arbor, Michigan; Lawrence Martin, Chief of the Division of Maps, Library of Congress, Washington, D.C.; J. E. Church, Professor of Meteorology, Agricult

The Committee members are the same as last year, namely: H. K. Barrows; Merrill Bernard; E. S. Cullings; R. S. Goodridge; G. A. Hathaway; Joseph Jacobs; F. T. Havis; H. S. Riesbol; Waldo E. Smith; F. F. Snyder; and H. G. Wilm.During the year one addition was made, namely, AURELIO BENASSINI of Mexico City and associated with the Mexican Government. One of Mr. Benassini's associates, Mr. Quintero, w

The calculations of Inglis show that the rate of transfer of angular momentum to the Earth's (liquid) core may be small enough to permit the axis of rotation of the core to lag about 2° behind that of the rock‐mantle in the precessional motion of the Earth. The travel‐time of P′ would be altered by about one‐fifth of a second, which is too small to be detected by a single observation made with eve

In the south‐central part of Scott County, Kansas, there is an area of shallow water‐table in which the ground‐water levels have declined steadily since 1932 (Fig. 1). In this area water has been withdrawn from wells for irrigation in increasing amounts during the last decade and the precipitation has been considerably below normal for the last seven years. Thus, the problem of interpreting the do

Engineers and hydrologists engaged on flood‐problems throughout much of the United States east of the Rocky Mountains must deal to a considerable extent with wide‐spread storms covering thousands of square miles. The gradations of meteorologic conditions as regard both area and time are relatively homogeneous during such storm‐events and are affected but moderately by orographical influences. Unde

The membership of the Committee during the past year was as follows: I. A. Dennison. Bureau of Standards; C. S. Scofield, Department of Agriculture; D. G. Thompson, Geological Survey; T. G. Thompson, University of Washington, Seattle, Washington; and C. S. Howard, United States Geological Survey, Washington, D.C. (Chairman).

Continued progress has been made in magnetic surveys over large sectional areas by G. R. MacCarthy. Beginning in Florida south of the Okeefenokee Swamp, magnetic traverses were measured and continued through the southern part of Georgia. The most northerly traverses crossed regions where they contacted the crystallines near the surface of the ground. All traverses were run in an east‐west directio