296 BIBLIOGRAPHY AND CARTOGRAPHY

———— Amphibole-Anthophvllite from Mt. Washington, Baltimore
Co.

Amer. Nat., vol. xix, 18S5, 1884.

Chemical analyses and description of a mouoclinic hornblende with the composition
of anthophylllte occurring as the gauge of chalcophyrlte ore.

———— Hornblende aus St. Lawrence Co., X. Y.; amphibol-an-
thophyllit aus Gegend von Baltimore (etc.).

N. J. B., 1885, ii, p. 170.

1886.

———— General Mining News—Maryland.

Eng. and Min. Jour., vol. xlii, 1886, p. 29.

The quarrying of large blocks of marble at the Beaver Dam quarries.

Ibid. p. 29.

ASHBURNER, CHAS. A. Coal.

Mineral Resources U. S., 1885, Washington, 1886, pp. 33-34.
Gives statistics on shipments, production, prices and wages in George's Creek
coal field.

BENTON, EDWARD R. Notes on the samples of iron ore collected in
Maryland.

Tenth Census, vol. xv, Mining Industries of the U. S., Washington, 1886,
pp. 245-260.

Notes, geological sections and analyses (p. 544).

CHESTER, F. D. Results from a study of the Gabbros and asso-
ciated Amphibolites in Delaware.

Proc. Amer. Assoc. Adv. Sci., vol. xxxiv, 1886, pp. 215-216.

CLARKE, F. W. Report of work done in Division of Chemistry and
Physics, 1884-85.

Bull. U. S. Geol. Survey No. 27, 1886, p. 72.

House Misc. Doc., 49th Cong., 2nd sess., vol. viii, No. 163.

Analysis by R. B. Brlggs of brown iron ore from near Timonium, Maryland.

COOK, R. S. The Manufacture of Fire-Brick at Mount Savage,
Maryland.

Trans. Amer. Inst. Min. Eng., vol. xiv, 1886, pp. 698-706.

Occurrence and composition of the clay used and description of the processes em-
ployed.

DAY, D. T. Chromium.

Mineral Resources U. S., 1885, Washington, 1886, p. 358.

" At Soldier's Delight, Maryland, chrome was mined to the extent of 100 tons."

FRAZER, PERSIFOR, JR. General Notes. Sketch on the Geology
of York County, Pennsylvania. (Read Dec. 4, 1885.)

Proc. Amer. Phil. Soc., Phila., vol. xxiii, 1886, pp. 391-410.
Discussion on the general structures, equally applicable to Maryland.