E. Diabase (basaltic glass), Mars Hill. Not resolvable into minerals. F. Rhyolite, Haystack Mountain. Contains quartz in a groundmass of orthoclase.

G. Volcanic tuff, southeast base of Castle Hill. Contains fragments of trachyte, andesite, devitrified glass, and lapilli.

H.. Diabase, Aroostook Falls, near Maine boundary line. Dike. Contains plagioclase, pyroxene, and pyrite.

2. LITCHFIELDITE AND ASSOCIATED MINERALS.

A. Elæolite-syenite, var. litchfieldite, from Litchfield. Described by Bayley in Bull. 150, p. 201; and in Bull. Geol. Soc. Amer., vol. 3, p. 231. Contains elæolite, two feldspars, and lepidomelane, with sodalite, cancrinite, and zircon as accessories. Analysis by L. G. Eakins, record No. 1298. P. R. C. 77.

The minerals found in this rock were quite fully described by Clarke in Bull. 42, pp. 28-38. Analyses by F. W. Clarke.

G. Sodalite, deep blue. P. R. C. 77.

H. Cancrinite, bright orange yellow. P. R. C. 77.
I. Cancrinite, pale yellow, cleavable.

J. Cancrinite, pale yellow, granular.

NEW HAMPSHIRE.

A. Elæolite-syenite, Red Hill, Moultonboro. Described by Bayley in Bull. Geol. Soc. Amer., vol. 3, p. 231. Contains elæolite, augite, hornblende, biotite, sodalite, albite, and orthoclase, with accessory apatite, sphene, magnetite, and an occasional zircon. Fibrous decomposition products are also present. P. R. C. 203.

B. Mixed albite and orthoclase from A.

C. Nepheline (elæolite) from A. Analyses by W. F. Hillebrand, record No. 1321. The mixed nepheline and feldspar were treated with dilute hydrochloric acid, and the residue was extracted with sodium carbonate solution. C represents the soluble part, and B the insoluble.

D. Camptonite, Campton Falls. Analysis by L. G. Eakins, record No. 1298. Described by J. P. Iddings in Bull. 150, p. 239. Contains hornblende, plagioclase, orthoclase, augite, iron ore, biotite, apatite, pyrite, and a mineral which appears to be analcite. Also variable calcite, serpentine, and chlorite P. R. C. 92.

E. Quartz-porphyry, Pemigewasset. Analysis by Eakins, No. 1298.

VERMONT.

1. ROCKS OF MOUNT ASCUTNEY.

Analyses by W. F. Hillebrand, record Nos. 1621, 1657. Samples received from T. A. Jaggar, jr. Petrographic data furnished by R. A. Daly.

A. Typical granitite. Contains quartz, orthoclase, plagioclase (microperthite), biotite, magnetite, sphene, apatite, and zircon.

B. Basic segregation in granitite. Contains biotite, hornblende, quartz, plagioclase, microperthite, much sphene and apatite, some magnetite and zircon.

C. Another sample of B.

D. Syenite. Contains hornblende, augite, orthoclase, microperthite, plagioclase, biotite, quartz, magnetite, sphene, apatite, and zircon. E. Basic segregation in syenite. Contains hornblende, augite, microperthite, orthoclase, plagioclase, quartz, magnetite, zircon, and apatite.

F. Syenite-porphyry. Contains orthoclase, quartz, nornoiende, magnetite, apatite, and zircon.