TWO CLAYS FROM HUMBOLDT RIVER BRIDGE, MILL CITY, NEVADA. A. From Upper Lahontan Lake-beds. B. From Lower Lahontan Lake-beds. Collected by I. C. Russell. Analyzed by T. M. Chatard. Color in both cases grayish. Material collected by J. S. Diller; by whom also the lithological separations were made. Analyses of rock and component parts as follows: A. Basalt. F. W. Clarke. B. Groundmass. T. M. Chatard. C. Hypersthene. T. M. Chatard. D. Feldspar, specific gravity, 2.637-2.714. T. M. Chatard. D In B a trace of P2O, was found, and in C a trace of manganese. and E are near labradorite, and are evidently mixtures. C, D, and E were received in very small quantities; not sufficient for full analysis. D and E therefore were treated with hydrofluoric acid, in order to render possible the estimation of the alkalies, and silica was taken by difference. TWO SAMPLES of limestone FROM MOUNDSVILLE NARROWS, TWELVE MILES BELOW WHEELINO, W. VA. A. Upper ledge. B. Lower ledge, Analyses by T. M. Chatard. MAGNETIC IRON ORE FROM NEAR BOZEMAN, MONTANA. Found in the Gallatin Range, between Middle and Bozeman Creeks, southwest of Bozeman. Received from A. C. Peale. Analysis by T. M. Chatard. The titanium was determined in a separate portion, and is probably high from presence of iron. Bull. 9. -2 (257) LIMONITE FRON CANAAN MT., TUCKER COUNTY, W. VA. Analysis by T. M. Chatard. Fe2O3 Moisture.. SiO2 P205 S. CaO MnO COAL FROM CRANSTON, R. I. Analysis by F. A. Gooch. Specific gravity, 2.209 at 150. Water.. Volatile matter Fixed carbon Ash..... Sulphur.......... (258) 80.53 13.20 1.95 1.98 trace. 2.34 none. 100 00 0.24 4.49 82.20 13.07 100.00 0.34 WATER ANALYSES. With the exceptions of the waters from Montana, the Utah Hot Springs, and the Virginia Hot Springs, the following waters were collected by the Division of the Great Basin, under the direction of Messrs. G. K. Gilbert and I. C. Russell. For sufficient reasons, it was necessary to abbreviate the analyses as much as possible, and this was done by avoiding the direct estimation of carbonic acid. Whenever carbonates were proved to be present all the other ingredients of a water were determined and the carbonic acid, reckoned as CO3, was taken as the difference between the sum of their weights and the weight of the total solid residue. In computing the probable compounds formed by the union of acids and bases, the chlorides and sulphates were first disposed of, and the bases in excess were then calculated as carbonates. This procedure gave usually a summation a little greater or less than the total solids directly found upon evaporating the water to dryness; and the variation of the result from 100 per cent. afforded a means of estimating the probable accuracy of the analysis. In most cases the samples of water received were insufficient for a search after the less common elements. These, therefore, were necessarily ignored, except in so far as the spectroscope or qualitative tests could reveal their presence. The gaseous contents of the waters received no consideration. In certain respects, therefore, all the analyses are to be regarded as imperfect; although they are fully adequate for the geological purposes which led to their being made. First, the actual weight in Second, the percentage of Third, the probable combi Each analysis is stated in three columns. grammes to the liter of each constituent. each relatively to the total solid residue. nation, also in grammes to the liter. The second column gives a means of comparing different waters as to their composition, irrespective of their greater or less salinity. The third column was computed in the simplest terms, and not with reference to complex and doubtful hypoth eses. PYRAMID LAKE, NEVADA. Four samples of water were analyzed (Clarke), as follows: D. Water of south end of the lake, depth of 61 meters. All four samples contained suspended flakes of silicious and calcareous matter. 19 |