45

stibnite, manufactured bismuth oxide and bismuthinite. The following groups are also thought to be isomorphous, since they occur in isomorphous compounds: CdO and CdS, MnO and MnS, and FeO and FeS. Mr. Dudley describes pseudomorphs of vivianite after roots of coniferous plants, from the clay banks of the Cumberland River, ten miles above Eddyville, Ky.—In a short note Wulff suggests a method by which plane angles may be measured under the microscope when the apex af the angle cannot be seen, and when its two sides cannot be brought into the field of view at once.—Mr. Brünnel, of the firm of Voight & Hochgesang, has invented a heating apparatus, attachable to any microscope, for use in mineralogical investigations.

New Books, etc.—The ninth annual report of the State Mineralogist of California contains statistics of the mineral products of the State for the year 1889, and accounts of the geology of the mining districts.47. -The Mineral Resources 48 of the United States for 1888, though late in appearing, is as welcome an addition to mineralogical literature as any of its predecessors have been. The wealth of information within the 630 pages of the present volume defies abstraction. The value of the metallic products of the country for the year in review exceeded the value of those mined in 1887 by about six millions of dollars; while the non-metallic products were larger by seventy-two millions than those of the preceding year. The totals for 1888 are: Metallic products, $256,257,517; non-metallic products, $322,293,159; unspecified, $6,000,000; grand total, $584,550,676. Of especial scientific interest is the description of the occurrence and association of the tin ore of the Black Hills, Dak.—The third part of Hintze's Mineralogy, which has but recently appeared, concludes the tourmaline group of minerals and takes up the humite, helvine, melanocerite, and other groups of rare silicates, as well as dioptase, staurolite, bementite, prehnite, and individual minerals of less common occurrence.

Am. Jour. Sci., Aug., 1890, p. 120.

45 Zeits. f. Kryst., XVIII., p. 277.

46 Neues Jahrb. f. Min., etc., 1890, II., p. 87.

47 Wm. Ireland. Ninth Ann. Rep. of the State Mineralogist for 1889. Cal. State Miner. Bureau, Sacramento, Cal.

48 D. T. Day. Mineral Resources of the United States for 1888. Washington Govt. Print. Office, 1890.

49 Leipzig. Veit & Co., 1890, pp. 321-480, 79 Fig.

Published January 10th, 1891.

MAKERS

SYRACUSE,

PAT. JAN. 21

1

Circular polariza
Contact action

Contact rims

Crystal structure

Etched figures

Glass inclusions
Halos

Heavy solutions
Hemihedrism in
Hydration of mus
Instruments
Isomorphism
Lithophysae
Massive rocks
Methods
Minerals
Acmite
Aegerine
Agalite
Allanite.
Apatite
Artvedsonite
Arsenic.
Arsenopyrite.
Astrophyllite.
Atelesite
Augite
Beekite
Bergmannite..
Beryl..
Brevicite
Biotite
Boracite
Brinachite.
Calamine
Calcite
Caracolite
Carphosiderite.
Celestite
Chalcocite
Connellite

Cordierite
Crocidolite

Cryptoperthite

Diallage..
Dumortierite
Eisenglimmer
Ekdemite
Erdmannite
Epidote.
Eididymite
Eukarite

Eukotite-titanite
Fergusonite
Fouqueite
Fuchsite.
Garnet

Gedrite

Glaucophane