Correspondence. 61 
The Tennesee phosphates, C. W. Hayes. 17th Ann. Rept., U. S. 
Geol. Survey, pt. 2, pp. 513-550, pis. 50-55, 1896. 
History of the discovery and report of progress in the study of Dae- 
monelix, E. H. Barbour. University (Nebraska) Studies, vol. 2, no. 2, 
pp. 81-124, pis. 1-18. January, 1897. 
Notes on the chemical composition of the silicious tubes of the devil's 
corkscrew, Daemonelix, T. H. Marsland. Ibid., pp. 125-130, Jan., 1897. 
A short history of the Great Lakes, F. B. Taylor. "Studies in Indi- 
ana Geography," 21 pp., May, 1897. 
Report of the section of chemistry and mineralogy, G. C. Hoffman. 
Geol. Survey of Canada, Ann. Rept., vol. 7, pt. R, 59 pp., 1897. 
The gold-quartz veins of Nevada City and Grass valley districts, Cal., 
Waldemai- Lindgren. U. S. Geol. Survey, 17th Ann. Rept., pt. 2, pp. 
1-262, pis. 1-24, 1896. 
The building materials of Pennsylvania, I, Brovvnstones, T. C. Hop- 
kins. 122 pp., 26 pis., appendix to Ann. Report of Pa. State College 
for 1896; 1897. 
Report on explorations in the Labrador peninsula among the East 
Main, Koksoak, Hamilton, Manicuagan and portions of other rivers, A. 
P. Low. Ibid., pt. L, 387 pp., 4 pis., 4 maps, 1896. With an appendix. 
Notes on the microscopic structure of some rocks from the Labrador 
peninsula, W. F. Ferrier. 
A treatise on I'ocks, rock- weathering and soils, G. P. Merrill, ix and 
411 pp., 25 pis; The Macraillan Co., New York, 1897. 
V. Proceedings of Scientific Laboratories, etc. 
MemoirsMuseum Comp. Zool., vols. 20 and 21, with atlas; ix and 837 
pp., 83 pis., May, 1897. The North American Crinoidea Camerata, 
Charles Wachsmuth and Frank Springer. 
CORPxESPONDENCE. 
The Hempstead Plains, Long Island, N. Y. When I first began 
the study of the drift phenomena on the west end of Long Island, I 
was led to suspect that the formation of the Hempstead plains was due 
to the breaking through of the glacial waters at Roelyn, as west of this 
point the glacial rivers seemed to be more confined to the north side of 
the island, behind the terminal moraine. A visit to the plains in ques- 
tion during the summer of 1882 seemed to confirm this conjecture for 
everywhere, as Warren Upham says, the moraine seemed buried by flu- 
viatile gravel and sand. 
On a recent visit, however, to this locality, I discovered a well defined 
kame-like moraine at East Williston, a little to the north of Mineola, It 
does not form a very conspicuous feature in the topography of the 
plains, yet the Roslyn branch of the Long Island railroad makes quite 
a deep cut through it. The erratics scattered over the surface show 
plainly that the ice sheet must have advanced to this point. 
