Scientific Serials

Abstract

American Journal of Science, August.—some of the features of non-volcanic igneous ejections, as illustrated in the four “Rocks” of the New Haven region, West Rock, Pine Rock, Mile Rock, and East Rock, by James D. Dana. A few of the conclusions arrived at from the observations recorded in this paper are that igneous eruptions occurred in the New Haven region after the sandstone had been upturned. The liquid rock forced its way between layers of the sandstone, and lifted up where the pressure of the rock as not too great to prevent the upheaval. This intrusive action was favoured by the fact that the fissure supplying the lava was inclined in the same direction as the layers of the uplifted sandstone. And the foliation of the underlying schists did not determine the course and dip of the supply fissures. The paper is illustrated by several excellent photographs of the formations investigated.—Note on a reconnaissance of the Ouachita mountain system in Indian territory, by Robert T. Hill.—The continuity of solid and liquid, by Carl Barus. By means of the simple arrangement described in this paper, the author is able to obtain at once the isothermals and isopiestics, and therefore the isometrics, both for the solid and liquid states of the substances experimented upon. The relation of solidification and fusion to pressure and the pressure changes of the isothermal specific volumes of solid and liquid at the solidifying and melting points can also be determined. And from such results the character of fusion and the probable position of critical and transitional points can be found. The author has as yet only investigated the behaviour of naphthalene by his method, but the whole work throws considerable light upon the relation of pressure to phenomena of fusion and solution.—Note on the asphaltum of Utah and Colorado, by George H. Stone. The author has visited all the known asphalte fields of Western Colorado and North-Eastern Utah. The observations he has made bear upon the origin of petroleum, asphalte, natural gas, and other subterranean hydrocarbons, but the facts are hardly sufficient to lead to definite conclusions.—Photographic investigation of prominences and their spectra, by George E. Hale. Account is given of the methods employed by the author for the photography of invisible solar prominences. Special attention has been directed to the photography of the bright prominence lines running through H and K, with a slit tangential to the sun's limb. Four reproductions of negatives showing prominences illustrate the paper.—A gold-bearing hot spring deposit, by Walter Harvey Weed. A microscopical and chemical examination of some specimens of ore from the Mount Morgan Gold Mine, Queensland, demonstrates that the mine is a deposit of a hot spring, the ore being siliceous sinter impregnated with auriferous hæmatite. This is the only hot spring deposit that has been found to contain gold in commercially valuable quantities, and although the sinter deposits from the hot springs of Yellowstone Park resemble those from Mount Morgan, no trace of the precious metals has been found in them.—Restoration of Stegosaurus, by O. C. Marsh. The species restored is Stegosaurus ungulatus, from the Upper Jurassic of Wyoming. A plate, representing the reptile one-thirtieth its natural size, accompanies the paper.