168 J. D. Dana—On Southern New England 
Se Pro ent “Map of the Coal Fields of the United States,” 
rof. C. H heock. We have heard several ee 
slakelicey memoir, The following are the areas given of the 
groups specially treated. 
New England basin -----.-.---...-..--- 750 sq. miles. 
Anthracite basins of Pennsylvania - -. ---- he peels 
ashen Ree PG eS Be.105 °° * 
ich = ea i ae aE pe pet a) eee Sr * 
esata asin anor 47188" °* 
Maks ee 84ae8” 
a ‘Coal Field pees be ee es 6,000.55 
203,808 
In addition to this, there are a few small areas of Triassic 
coal, amounting to a few hundred square miles at most. The 
show the areas which the 
hen we consider the adnbatiGual and statistical value of 
the Atlas under consideration, it is greatly to be regretted that 
a large edition was not ordered by Congress, to be sold at the 
lowest cost of manufacture. As it is, the lithographer, Mr. 
Bien, is allowed to issue an edition at his own risk, and this 
will allow all who wish the work to purchase it at a cag which 
under the circumstances is very reasonable. . H. B. 
Art. XXIV.— On Southern New England aering the melting of 
the great Glacier ; by JamES D. Dana. No. L 
GLACIAL scratches, southeastward in direction,* on the 
Taconic summit, Mt. Everett, in the southwest corner of Massa- 
chusetts, at a height of 2, 600 feet above the sea, afford evidence 
that the ice which covered New England in the Glacial period 
overtopped this mountain, and had an elevation in that region 
not shah under 3,000 feet. Similar facts in the White Moun- 
tains place the height there at not less than 5,800 feet.t Calcu- 
lating the slope of the upper surface of the ‘glacier over New 
England from these data, it follows that the ‘height above the 
of Mount acces alk sls ke widvicina & Shehar cotimaate 
