Scientific Serials

Abstract

American Journal of Science and Arts, June.—The original articles in this number are:—Results of dredging expeditions of the New England Coast in 1874, by A. E. Verrill. More than 100 species new to the iauna of southern New England were secured. Most of these are northern species, but many are undescribed. A table giving nature of bottom and temperature at the surface and bottom of the sea is given.—Mr. Fontaine's paper on the Primordial Strata of Virginia is continued and concluded. At the end is given a comparison with the metamorphic crystalline rocks of the Blue Ridge.—On the occurrence of the Brown Hematite deposits of the Great Valley, by Frederick Prime, jun.—Note on some new points in the elementary stratification of the Primordial and Canadian rock of south central Wisconsin, by Roland Irving. The order for the Lower Silurian strata of Wisconsin has been generally accepted as (beginning from below) 1. Potsdam sandstone; 2. Lower magnesian limestone; 3. The St. Peter's sandstone; 4. The blue and buff limestones; 5. The Galena limestone; 6. The Cincinnati group. The succession as now made out is (beginning from below) 1. The Lower or Potsdam sandstone; 2. The Mendota limestone; 3. The Madison sandstone; 4. The main body of limestone; 5. The St. Peter's sandstone. A table of correlation is given with the Mississippi Bluffs and the Minnesota River.—On the application of the horizontal pendulum to the measurement of minute changes in the dimensions of solid bodies, by Prof. O. N. Rood.—On diabantite (a chlorite), by G. W. Hawes.—Re-discovery of double star H.I. 41, by 5. W. Burnham. It is about 46′ north of the well-known double star ψ Draconis, and is easily found without an equatorial mounting.—On the distribution of electrical discharges from circular discs, by C. J. Bell.—Examination of gases from the meteorite of Feb. 12, 1875, by A. W. Wright.—On limonite with the colour and transparency of göthite, by Prof. Mallet.—Under the head “Scientific Intelligence,” the original notes are:—On the surface geology of Ohio; On the Prototaxites of Dawson; On the Crustaceans. of the caves of Kentucky and Indiana, together with several reviews.