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The membership of the Committee remains the same as stated in the Transactions of the 15th Annual Meeting, except that Kenneth N. Phillips has taken the place of Carl P. Richards, as representative of the Mazamas, of Portland, Oregon.The Committee submits the following report on the variations of glaciers in the continental United States and Alaska for 1935 or, more precisely, for the 12‐month per

Interest in problems of ground‐water hydrology continues unabated. As proof of this statement it is only necessary to state that of 57 papers listed for presentation at the present annual meeting of the Section of Hydrology and of the Pacific Coast meeting of the Section on January 31 and February 1, 26 papers, or 45 per cent, related to some phase of ground‐water hydrology. In this connection, at

The water‐shortage caused by the drought of 1934 in the Middle West drew nation‐wide attention to the lack of adequate information on the relation of precipitation to water‐supplies. The shortage was especially severe in the Dakotas because precipitation had been below normal in North Dakota since 1930 and in South Dakota since 1931. Many wells and springs failed, numerous streams ceased to flow,

I wish to present what evidence we have as to the geochemistry of boron minerals as related to volcanological processes, or, in other words, what are the volcanological boron compounds?Volcanological processes, considered only as they apply to this question, may be grouped for present convenience as follows: (1) Extrusion of volcanic rocks; (2) volcanic exhalations including fumaroles and solfatar

During the summer of 1935 the United States Geological Survey, in cooperation with the South Dakota Geological Survey, made a field‐study and report of the artesian conditions in the west‐central part of South Dakota. This study covered the semiarid plains‐region between the Black Hills uplift and the Missouri River, in which the Pierre shale is at or very near the surface. One of the important fa

Although the widest‐known and most conspicuous task of the United States Geological Survey with reference to surface‐waters has been the measurement of discharge, attention has always been given to the suspended and dissolved matter carried in them. From 1902 to 1909 the Survey published about 20 reports on the quality of surface‐waters. These reports dealt largely with stream‐pollution and its pr

The rugged topography of a great part of the Colorado River Basin is a significant factor in determining the quantity of water and suspended matter carried by the River. The mountainous regions of Colorado and Wyoming contribute a large part of the flow of the River, whereas the central part of the Basin, cut by deep gorges and canyons, contributes a large part of the suspended matter carried by t

The urban and agricultural development in most areas of southern California have depended on the underground water‐resources of which more and more use has been made. It has been estimated that in the South Coastal Basin during the summer 90 per cent of the water‐supply for irrigation and other purposes developed locally is obtained from underground sources [see 1 of “References” at end of paper].

The factors affecting relationship between precipitation and consequent runoff are multitudinous and their interrelation is exceedingly complex. They vary widely from time to time and place to place. Basic data are meager and the weight to be given to any single factor is usually uncertain. Runoff‐characteristics of drainage‐areas within the same region will frequently be quite dissimilar. Under t

A program of water‐level measurements in about 350 wells scattered throughout Nebraska was begun in 1934 by the United States Geological Survey in cooperation with the Conservation and Survey Division of the University of Nebraska (see L. K. Wenzel, A state‐wide program of periodic measurements of ground‐water level in Nebraska, Trans. Amer. Geophys. Union, 16th annual meeting, pp. 495–498, 1935).

The only unpublished comprehensive Geological Survey records of dissolved matter in surface‐waters are the results obtained in the study of the Colorado River and its tributaries since 1930. The records are mainly analyses of 10‐day composites of daily samples, although there are several analyses of spot‐samples from some streams in the basin and about 4000 single determinations of chloride or sul

The tourmaline-copper deposits of the Virginia mining district, New Mexico, lie along veins that were plugged and reopened repeatedly during the process of mineral deposition. At some time between the second and third stages of deposition the solutions removed calcite, sericite, and chlorite from interstitial and included fragments of altered wall-rock in the veins and thereby produced honeycombed