328 BIBLIOGRAPHY AND CARTOGRAPHY

WARD, LESTER F. The Potomac Formation.

15th Ann. Rept. U. S. Geol. Surv., 1S93-94, Washington, 1895, pp. 307-397,
plates.

A paper dealing with the stratigraphical relations and especially with the descrip-
tion and correlation of the vegetable remains. Accompanied by numerous sections and
illustrations.

WEEKS, JOSEPH D. Manganese.

16th Ann. Rept. U. S. Geol. Surv., 1894-95, part iii, Washington, 1893.

Maryland Manganese Products, p. 416.

WHITNEY, MILTON. Soil Moisture, A Record of the Amount of
Water Contained in the Soils during the Month of July, 1895.

Bull. 3 U. S. Dept'. Agri. Div. of Agri. Soils, Washington, 1895, 23 pp. and
diagrams.

Contains diagrams of soil moisture of the early truck lands of Mardella Springs, Md.

———— Truck Lands of the Atlantic Seaboard.

Year-book, Dept. Agri., 1894, Washington, 1895, 129 pp., 143 illustrations.
Discussion of the truck soils of Maryland, with many chemical and mechanical
analyses of sub-soils, pp. 139-143.

WILLIAMS, G. H. The general relations of the Granitic Rocks in
the Middle Atlantic Piedmont Plateau (Introduction to Keyes'
" Origin of Central Maryland Granites ").

15th Ann. Eept. U. S. Geol. Surv., 1893-94, Washington, 1895, pp. 657-684,
with plates.

A study of highly metamorphosed ancient plutonic rocks and of the origin of the
Maryland pegmatites, which are believed to be both segregative and intrusive.

1896.

ANON. Directory to the Iron and Steel Works of the United States,
compiled and published by the American Iron and Steel Association.
13th edit, corrected to Jan. 1896.

Maryland blast furnaces (27 and 70), rolling mills (144), bessemer (199), crucible steel
(210), plate and sheet (215), tin plate (229), bloomeries (240), shipbuilders (257), light
locomotives (260), malleable iron (263), cast iron pipe (270), car wheels (2S2), car build-
Ing (290).

CLARK, WM. B. The Eocene Deposits of the Middle Atlantic Slope
in Delaware, Maryland and Virginia.

Bull. U. S. Geol. Surv. No. 141, 1896, 167 pp. 40 plates.

House Misc. Doc., 54th Cong., 2nd sess,, vol. —, No. 31.

A general discussion of the geological features, distribution, character and corre-
lation of the deposits, with a description of the contained fossils.