Magnetite, skeleton crystals of, characteristic of volcanic rocks and slags

"

of the Dalhousie gneissose-granite not due to heat as a pro

duct of pressure

not caused by plutonic heat

pressure. Some remarks on .
cause of

102; XX, 203

.XV, 47; XVI, 143; XVII, 68, 71; XVIII, of some silurian and carboniferous rocks may have been pro. duced by heat as a product of tangential pressure resulting information of hydro-mica schists does not require the agency of great heat, Mica, cryptocrystalline variety described

points of difference between mica in rocks of eruptive and sedimen
tary origin

XX, 115

XVI, 133; XVII, 169
XVI, 133; XVII, 70

XV, 158, 159

XVI, 130, 131; XVII, 64
XVI, 131

shrinkage cavities in, an evidence of heat X, 222; XVI, 130, 149; XVII, 60, 64, 69 a quartzite

XVI, 104

Opacite formed on microliths common to Aden lavas, and gneissose-granite of

in granules represents magnetite imperfectly crystallised

Organic structures simulated in granite

Orthoclase, fibrous variety referred to microcline

Parallelism of structure in granite due to traction acting on a partially cooled

"

crystals not necessarily of different "generation" from the small

polysynthetic structure of, characteristic of the gneissose-granite of

of secondary origin full of liquid cavities with moving bubbles

Schists, fragments of, imbedded in granite.
Schorl, reheating of after crystallization

Section (diagrammatic) of Himalayas from Dalhousie to Sách Pass

XVII, 168

XVI, 134, 135, 142

XVIII, 106

XVIII, 107

XVIII, 108

. XV, 148

XVI, 132–134, 140; XVII, 65,

66; XVIII, 80 XVI, 134, 135, 142

Trap of Chamba-Dalhousie area XV, 34; XVI, 36, 39-41 ; XVII, 34; XVIII, 82-86, 89

,,microscopic characters of

XVI, 178; XVIII, 93 XV, 34, 37; XVIII, 92; XIX, 81

Central Himalayas

Darang and Mandi

Deccan

XVI, 42; XX, 104

ADDITIONS TO THE MUSEUM.

FROM IST OCTOBER TO 31ST DECEMBER 1886.

A series of 16 specimens in mahogany case, illustrating the extraction of copper from cupreous pyrites.

PRESENTED BY THE THARSIS SULPHER & COPPER Co., LD., GLASGOW.

Nine specimens of minerals from different localities in England.

PRESENTED BY THE BRITISH MUSEUM.

Specimens of magnetite and limonite and steatite from Gangai, Jabalpur district. PRESENTED BY MR. C. W. McMINN, C.S.

ADDITIONS TO THE LIBRARY.

FROM IST OCTOBER TO 31ST DECEMBER 1886.

Titles of Books.

Donors.

ALLEN, Alfred H.-Commercial Organic Analysis, 2nd edition, Vol. I. 8° London, 1885. BALL, Valentine.-Observations on lion-breeding in the gardens of the Royal Zoological Society of Ireland. 4° Pam. Dublin, 1886.

THE AUTHOR. BECKER, George F.-The Washoe Rocks. 8° Pam. San Francisco, 1885. THE Author. DABNEY, Charles W.-Methods of analysis of Commercial Fertilizers. 8° Pam. Washington, 1885. REVENUE & AGRICULTURAL DEPARTMent. DESLONGCHAMPS, Eugène Eudes.-Notes Paléontologiques. Vol. I. 8° Paris, 1863-1869. J. WOOD-MASON.

EMMONS, S. F., and BECKER, George F.-Statistics and technology of the precious metals. 4° Washington, 1885. REVENUE & AGRICULTURAL DEPARTMENT.

EXHIBITIONS.-Allgemeine Landes-Ausstellung zu Budapest, 1885. Special-katalog der VI-ten Gruppe für Bergbau, Hüttenwesen und Geologie. 8° Budapest, 1885. 'ROYAL HUNGARIAN GEOLOGICAL INSTITUTE.

Die Königlich Ungarische Geologische Anstalt und deren Ausstellungs-
Objecte. 8° Budapest, 1885.

ROYAL HUNGARIAN GEOLOGICAL INSTITUte.
Colonial and Indian Exhibition, London, 1886. Descriptive catalogue
of a collection of the Economic Minerals of Canada by the Geological
Corps. 8° London, 1886.

Colonial and Indian Exhibition.
London, 1886.

GEOLOGICAL SURVEY OF CANADA.

Official catalogue. 2nd edition. 8°

catalogue of exhibits by the Government of India and private exhibitors. 8° London, 1886.

GANNETT, Henry.-Report on the building stones of the United States, and statistics of

the quarry industry for 1880. 4° Washington, 1883.
REVENUE & Agricultural Department.