416 The American Geologist. June, isos 
were tardy in joining the chief resultant mass, and the latest of them, 
in falling by gravitation to the moon, melted by the impact not only 
themselves but the part of the lunar surface w^here they struck, and 
threw up around those places the crater rims as steep mountains. The 
whole process of the moon's gathering its formerly scattered material 
seems, according to Mr. Gilbert, to have been completed at least before 
the deposition of the earth's Paleozoic sediments, else they would here 
and there reveal evidences of collision of some of the portions of the 
previous ring matter, since these must have fallen not only on the 
moon but in like manner on the earth. The absence of atmosphere 
about the moon has so long permitted the very steep and high lunar 
mountains to remain unaffected by agencies of erosion. 
Oeographicdl lllustratwns: suggestions for teaching Physical Oeogra- 
Tpihy based on the physical features of southern Xcw England. By 
William Morkis Davis, Professor of Physical Geography in Harvard 
University. 12mo, pp. 46, Cambridge, Mass., 1893. Price, 10 cents. 
In this excellent little pamphlet the chief topographic features of Mass- 
achusetts, Rhode Island, and Connecticut are described, and their 
means of origination by subaerial erosion, partial or nearly complete 
base-levelling, succeeding uplifts and new valley cutting, and latest by 
glaciation, are explained. This is done so simply, clearly, and attract- 
ively, although giving the latest and in part very recent results of the 
most advanced investigators in geology and geomorphology, that the 
teachers of primary and grammar schools may readily take their classes 
over this partially new scientific ground, without their encountering 
any difficulties beyond their understanding, and even with dawning and 
increasing pleasure instead of becoming wearied. 
Ythildningar i ryska och finska Karelen med sdrskild hdnsyn till de 
karelsha randmordnerna. By J. E. Rosberg, pp. 128, with a map, sec- 
tions, and photographs. Fennia, vol. vii. No. 2, Helsingfors, 1892. 
The glacial geology of a broad belt of Finland and northwestern Rus- 
sia, stretching from the Gulf of Finland and lake Ladoga north to the 
northwestern extremity of the White sea, forms the subject of this 
number of Fennia. The map shows the directions of glacial striation, 
sand and gravel tracts of modified drift, dunes, marginal retreatal 
moraines, and eskers. 
RECENT PUBLICATIONS. 
I. 
Ooveniment and State RejJorts. 
Geological Survey of Arkansas, John C. Branner, state geologist, 
1891, Vol. I, Mineral Waters. 
Pennsylvania Geological Survey, J. P. Lesley, state geologist, 1892^ 
Vol. II, Summary Final Report, Upper Silurian and Devonian. 
