25\ The American Geologist. October, 1894 
Carvill Lewis contributed to more full and true interpretation of the 
drift formations of Britain, in the light of his previous work in the 
United States, we note the substitution of ice transportation instead of 
marine submergence to account forthedrift with fragments of man^ 
species of sea shells at great bights on Mod Tryfaen and in other locali- 
ties; exact tracing of the boundaries of the glaciation; the recognition 
of man\ areas of ice accumulation and dispersal of boulders; that the 
Scandinavian ice-sheet extended to England, becoming confluent with 
the British ice-fields; doubt <>l' interglacial epochs; and the discrimina- 
tion of till formed beneath the ice, moraines on its margin, and boulder- 
clay, supposed to have been borne by Boe and berg ice beyond the bor- 
der of the ice-sheets on thesurfaceof large extra-morainic lakes. The 
whole work will be of great value in stimulating- further investigations 
of the many and difficult questions which still remain to be altogether 
convincingly answered, so thai at length a general unanimity of view- 
shall be reached concerning the origin of the glacial deposits and the 
causes of glaciation in the British Isles and in all other drift-bearing 
legions. w. r. 
T//r Mineral Resources of tlu United States, Calendar year 189S. David 
T. Day. Pages vii, 799; Washington. 1894. (U. S. Geol. Survey). This 
volume appears with unusual promptness, probably under the stimulus 
of competition with "The Mineral Industry."' published by the Scien- 
tific Publishing Co.. of New York, of which a notice appeared in the 
last number of the GEOLOGIST. This is. in the main, of the same char- 
acter and scope as the nine preceding reports from this department of 
the survey. The statistics which it presents are obtained from the 
most reliable sources, and the various mining products are reviewed 
separately by statistical experts. The chapters on petroleum, natural 
g-as and asphallum are especially full and valuable. n. h. w. 
RECENT PUBLICATIONS 
T. Government <nt<i State Reports. 
Pennsylvania Geological Survey, 1893, Atlas Summary Final Report, 
contains: Maps of the state, bituminous coal mines and quarries, Leb- 
anon, Bucks and Montgomery counties. 
Pennsylvania Geological Survey, 1893, Atlas contains: Geological maps 
of Schuylkill, Carbon. Berks and Dauphin counties; topographical map 
of the Blue mountain at Port Clinton. 
Annual Report of the Smithsonian Institution, for 1892, contains: The 
relation of biology to geological investigation. A series of essays dis- 
cussing the nature and scientific uses of fossil remains and the necessity 
for their systematic collection and permanent conservation in public 
museums, < lharles A. White. 
