Recent Piiblications, 61 
of which the one best known is the Delaware wind-gap between the 
Lehigh and Delaware water-gaps in Blue mountain. This wind-gap 
marks the unfinished notch cut by some stream whose headwaters 
have since been diverted, probably to the Lehigh. 
The Structure of DrumUns. By Warren Upham. (From Proceedings 
of the Boston Society of Natural History, vol. xxiv, 1889, pp. 228-242). 
The most important part of this paper describes sections of the drum- 
lins that form Third and Fourth clifTs on the coast of Scituate, Mass., 
about twenty-five miles southeast of Boston, consisting of till on the 
surface and to a depth of 15 to 25 feet or more and a central mass of 
modified drift, beds of gravel, sand and clay, with arched stratification. 
The bedding of the modified drift, and the obscure lamination which 
is commonly a characteristic of the till and is distinctly seen there, 
are parallel with each other and conformable with the line of division. 
No evidence of erosion, nor of tumultuous pushing forward, was 
observed ; but instead these sections appear to represent continuous 
deposition. The author believes that these drumlins, and probably 
the other drumlins so well developed upon many areas in the vicinity 
of Boston, were accumulated rapidly beneath the ice-sheet and near 
its receding margin at the close of the glacial period. 
RECENT PUBLICATIONS. 
1. State and Government reports. 
On the form and position of the sea-level. R. S. Woodward. Bui. 
No. 48, U. S. Geol. Sur. 
Latitude and longitude of certain points in Missouri, Kansas and 
New Mexico. R. S. Woodward. Bui. No. 49. U. S. Geol. Sur. 
Formulas and tables to facilitate the construction and use of maps. 
R. S. Woodward. Bui. No. 50, U. S. Geol. Sur. 
On invertebrate fossils from the Pacific coast. Charles A. White. 
Bui. No. 51, U. S. Geol. Sur. 
Subaerial decay of rocks and origin of the red color of certain forma- 
tions. Israel C. Russell. Bui. No. 52, U". S. Geol. Sur. 
The geology of Nantucket. N. S. Shaler. Bui. No. 53, U. S. Geol. 
Sur. 
o. Papers in scientific journals. 
Am. Jour. Sci. Dec. No. The lower Cretaceous of the southwest and 
its relation to the underlying and overlying formations. Chas. A. 
White. Hinge of the pelecypods and its development, with an attempt 
toward a better subdivision of the group. Wm. H. Dall. Relation of 
the uppermost Cretaceous beds of the eastern and southern United 
States. Robert T. Hill. Tertiary-Cretaceous parting of Arkansas and 
Texas. Robt. T. Hill and R. A. F. Penrose, Jr. A description of sev- 
eral Yttria and Thoria minerals from Llano county, Texas, W. E. 
Hidden and J. B. Mackintosh. 
