258 Scientific Intelligence. 
16. Researches on Solar Heat and its Absorption by the Earth's 
Atmosphere: A report of the Mount Whitney Expedition, pre- 
pared under the direction of Major-General W. B. Hazen, Chief 
Signal Officer, by S. P. Lanetey, Director of the Allegheny 
Observatory. 242 pp. 4to, with a map, twenty-one plates and 
wood cuts. Washington, 1884, (Professional Papers of the Signal 
. XV).—This volume contains a detailed account of 
Tables, Meteorological and Physical, by ArNotp Guyot, 
Ph.D., LL.D. Fourth edition, revised and enlarged, edited by 
Wit1iaM Lissey, Jr. 738 pp. 8vo. Washington, 1884, (Smithson- 
ian Miscellaneous Collections).—An interval of twenty-five years 
about a year ago, and the final editorial work has been well pet 
formed by Professor William Libby, Jr. The volume appears 
now much enlarged and improved and fitted for even a wider 
sphere of usefulness in the country than it has filled heretofore. 
II. Grotocgy anp MINERALOGY. 
1. The Copper-Bearing Rocks of Lake Superior ; by R. D. 
Irvine—The editorial note on this subject in this Journal for 
eee in the general geological scale. While Professor 
inchell w 
argument, in favor of his position as to the Potsdam age of the 
Keweenaw series, drawn “from the fossils in the slates and sand- 
stones of the St. Croix is indecisive, as remarked by Professor 
Irving, since the precise age of the fossils, whether Potsdam si 
later, is not certain. The Lingule of the sandstones of Taqua 
menon Bay, found by Rominger, which led him to refer those sand- 
stones to the Potsdam, Professor Winchell says make the Kewee 
naw series Potsdam, ¢f the rocks are equivalents.” 
