308 BIBLIOGRAPHY AND CARTOGRAPHY

SCHARF, J. T. Report of the Commissioner of Land Office, Report
from Jan. 1st, 1888, to Jan. 1st, 1890, ..... with a series of carefully
prepared articles on Maryland's resources....... 1890.

Md. House of Delegates, Dec. Sess., 1890, 8vo, 148 pp.

SWANK, JAMES M. The Iron and Steel Industries of the United
States in 1888 and 1889.

Mineral Resources U. S., 1888, Washington, 1890.
Statistics on production, pp. 11, 23.

UHLER, P. R. Notes on Maryland.

Macfarlane's An American Geol. R. R. Guide, 2nd edit., Appleton. 1890.

Gives many notes on the formations along the different railroads of the state.

———— Notes and Illustrations to " Observations on the Cretace-
ous and Eocene Formations of Maryland."

Trans. Amer. Acad. Sci., vol. i, 1890, pp. 97-104.

Gives a general descriptive section in which are introduced the divisions " Alternate
clay-sands," " black marls," " clay marls," " mottled sands," " loose marl," and " cell
marl." Also columnar and diagrammatic sections.

WILLIAMS, G. H. Geology of the vicinity of Baltimore.

Macfarlane's Geol. R. R. Guide, 2nd edit., pp. 334-335.

Descriptions of the crystalline rocks, in the form of short notes on the formation at
different stations.

———— Administrative Report. The work in the crystalline rocks
of Maryland.

10th Rept. U. S. Geol. Surv., 1888-89, pt. i, Washington, 1890, pp. 152-154.

(Abst.) idem, pp. 31-32,

Account of scope of the work and statement of results of a study along the boun-
dary between the crystalline and semi-crystalline rocks and in the area about Baltimore.

———— The Non-feldspathic Intrusive Rocks of Maryland and the
cause of their Alteration.

Amer. Geol., vol. vi, 1890, pp. 35-49.

This was written as the first of two papers describing the serpentine, peridotites and
pyroxenites of the state and deals with the original rocks. The second paper was to
deal with the alteration of these rocks, but was never published.

1891.

ANON. General Mining News—Maryland.

Eng. and Min. Jour., vol. li, 1891, p. 175.

Notes on the gold mines of Montgomery county. Occurrence of galena.

———— Mining Notes.

Eng. and Min. Jour., vol. li, 1891, p. 238.

Census Bull. Coal.

Statistics, coal, p. 28; p. 175, half column on Montgomery gold.