294 BIBLIOGRAPHY AND CARTOGRAPHY

BROCK, E. A. Early Iron Manufacture in Virginia, 1619-1776.

Proc. U. S. Nat. Mus., vol. viii, 1885, pp. 77-80.

The author refers, p. 79, to the purchase of iron from Maryland in early times.

CHESTER, FREDERICK D. The Gravels of the Southern Delaware
Peninsula.

Amer. Jour. Sci., 3rd ser., vol. xxix, 1885, pp. 36-44.

Post Glacial bowlders of Snow Hill, Md., pp. 41-43. This deals especially with the
Quaternary and modern deposits, though discussing the surface deposits of the whole
area.

———— A Review of the Geology of Delaware, Results of a survey
in progress. (Abst.)

Proc. Amer. Assoc. Adv. Sci., vol. xxiii, 1885, pp. 400-401.

CLARKE, F. W. Mica.

Mineral Eesources U. S., 1883-84, Washington, 1885, pp. 906-912.
Mentions the mica mines of Howard and Montgomery counties which are not at
present worked, p. 908.

DAY, D. T. Chromium.

Mineral Eesources U. S., 1883-84, Washington, 1885.

Gives short history of chromium Industry in Maryland, p. 567.

———— Cobalt.

Idem, p. 544.

Mentions linnaelte and niccollte from Flnksburg and Sykesville, Carroll county.

———— Manganese.
Idem, p. 551.

Black oxide of manganese formerly mined at Brookville, Montgomery county, but
now abandoned.

GANNETT, HENRY. Administrative Reports. Topographic work
in Maryland.

5th Ann. Rept. U. S. Geol. Surv., 1883-84, Washington, 1885, pp. 7-8.
Notes on the topographic work done in Western Maryland and about Washington.

———— Administrative Reports. Topographic work in Maryland.
6th Ann. Rept. U. S. Geol. Surv., 1884-85, Washington, 1885, p. 8.

———— Boundaries of the United States and of the several states
and territories with a historical sketch of the territorial changes.

Bull. U. S. Geol. Surv. No. 13, 1885, pp. 79-90.
House Misc. Doc., 48th Congress, 2nd sess., vol. xli.

Contains history of the grants and the determinations of the location of the boun-
dary lines between Maryland and Pennsylvania, Delaware, Virginia and West Virginia.