American Journal of Science, June.—Topographical development of the Triassic formation of the Connecticut Valley, by William Morris Davis. In this paper are embodied the results of two visits paid to the region about Meriden with the Harvard Summer School of Geology in 1887 and 1888. After describing the topographical development of the Triassic belt, the author shows that the whole region was base-leveled in late Cretaceous times, and the present valleys worn in the Cretaceous base-level plain after its elevation. The Connecticut River was originally consequent on the monoclinal faulting, and still persists near the course then taken, but has entered a second cycle of life as a result of the elevation of the lowland that was produced in its first cycle.—Analyses of three descloizites from new localities, by W. F. Hillebrand. The specimens, of which full analyses are here given, came from the mines of Beaverhead County, Montana; Grant County, New Mexico; and Cochise County, Arizona. It is suggested that, in view of the well-defined character of all these highly cupriferous varieties, they might be appropriately designated by some common distinctive name, such as Rammelsberg's cupro-descloizite, as indicating the relationship to descloizite.—A new meteorite from Mexico, by J. Edward Whitfield. This specimen of meteoric iron, weighing 33 kilos, came originally from the Sierra de San Francisco in the State of Durango, date of discovery and name of finder being unknown. Analysis shows iron 91˙48, nickel 7˙92, cobalt 0˙22, with traces of sulphur and carbon. Slices when etched show rather coarse Widmanstättian figures with dark diagonal bands of triolite.—Contributions to the petrography of the Sandwich Islands, by Edward S. Dana. The eruptive rocks here described were partly obtained in 1887 by Prof. J. D. Dana, and partly in 1888 by the Rev. E. P. Baker, of Hilo. They include about thirty specimens from Kilauea, a dozen from the island of Maui, and a like number from the island of Oahu. The chief points brought out by their study are the characters of the clink-stone-like basalt with its novel forms of feather-augite, and also of the heavy chrysolitic basalt, both from the summit crater. The lavas from Maui and Oahu belong mostly to the basaltic type, though often resembling andesite in appearance.—The determination of water and carbonic acid in natural and artificial salts, by Thomas M. Chatard. An apparatus is described, which has been successfully used for the analysis of a large number of natural and artificial alkaline carbonates, giving results satisfactory both for accuracy and the ease and rapidity with which they were obtained. The method is in every way superior to the distillation process, and promises to be of value for technical purposes. —Preliminary note on the absorption spectra of mixed liquids, by Arthur E. Bostwick. The experiments here described were undertaken to determine the true character of the absorption spectra of mixed liquids, which, according to Prof. Melde, are not formed by simple addition of the component spectra, but by the shifting of the bands, a large band of one liquid seeming to attract a small band of the other, and more strongly as the proportion of the former in the mixture is increased. On the other hand, Dr. Shuster held that where a small band falls on the slope of a large one the effect of optical addition is to shift the apparent maximum of absorption. But Mr. Bostwick's experiments apppear to prove that, while a small part may be due to the cause alleged by Dr. Shuster, the bands are shifted principally by a true action of one liquid on the other.—Notes on metallic spectra, by C. C. Hutchins. An attempt is here made to determine the wave-length of several metallic lines with something of the precision with which wave-lengths of solar lines are known and tabulated.—On allotropic forms of silver, by M. Carey Lea. By means of a new reaction (the reduction of silver citrate by ferrous citrate) the author has obtained three remarkable forms of allotropic silver, the properties and physical condition of which are here described in detail.