Sketch of Henry Carvill Lewis — Upham. :n7 
have soon convinced him of the correctness of the opinions of 
Searles V. Wood, Jun., Mr. Skertchly, and James Geikie,* that 
land-ice during the earlier glacial epoch overspread all the area 
of the Chalky boulder-clay, extending south to the Thames. 
Small portions of northern England, however, escaped glaciation 
both then and during the later cold epoch when the terminal 
moraines mapped by Lewis were accumulated; and these tracts 
of the high moorlands in eastern Yorkshire and of the eastern 
flank of tlie Pennine Chainf are similar to the driftless area of 
south-western Wisconsin. 
Comparison of the drift in the United States and Great Britain 
enabled professor Lewis to refer the British modified drift, both 
that often intercalated between deposits of till and that spread 
upon the surface in knolly and hilly kames and more evenly in 
plains and along valleys, to deposition from streams supplied by 
the glacial melting, the material being washed out of the ice- 
sheet. These beds, however, are to be carefully distinguished 
from those of interglacial and post-glacial age. It is greatly 
to be regretted that this sagacious observer was not spared for 
the fulfillment of his plan of yet more extended study of Euro- 
pean glacial deposits in the light of his wide knowledge of the 
terminal^moraine and other drift formations in this country. 
The following is a nearly complete list of professor Lewis' 
published papers: — 
"Report on the Terminal Moraine in Pennsylvania and western New 
York. Illustrated by a map of Pennsylvania showing the glaciated region, 
eighteen photographic views of the moraine, and thirty-two page-plate 
maps and sections," pp. 299. Second Geol. Sur. of Pa. Report of Progress, 
Z. 1884. 
"On a New Substance resembling Dopplerite from a Peat Bog at Scran- 
ton." Proc. Amer. Phil. Soc, vol. xx, 1883, pp. 112-117. Proc. Acad, Nat. 
8ci., Phila., 1883, pp. 52, 53. An. Rep., Geol. Sur. of Pa. for 1885, pp. 
047-656. 
"Note on the Aurora of April 16-17, 1882." Proc. Amer. Piiil. Soc, xx, 
pp. 283-291. 
"Map of the Terminal Moraine." Id., xx, pp. 662-664. 
"A great Trap Dyke across south-eastern Pennsylvania." Id., xxii, 1885, 
pp. 438-456, with map. Proc. Amer. Assoc, for Adv. of Sci., Phila., vol. 
xxxiii, 1884, pp. 402, 3. 
* Quart. Journ. Geol. Soc, xxxvi, 1880, pp. 463-500; Great Ice Age, sec- 
ond ed., pp. 350-365. 
t A. Geikie's Text Book of Geology, p. 903 ; Quart. Journ. Geol. Soc, 
xxxii, 1876, pp. 184-190. 
