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stitute of Technology, Boston, Mass...

PRE-CAMBRIAN Rocks..

WALES...

SCOTLAND..

IRELAND..

LEICESTERSHIRE.

SHROPSHIRE..

ARDENNES..

BRITISH SERPENTINES..

WISCONSIN.

THE BLUE RIDGE...

EASTERN CANADA..

PALEOZOIC Rocks..

SALT DEPOSITS..

GEOLOGY OF INDIA...

GEOLOGY OF THE ARCTIC REGIONS.

MESOZOIC OF SCOTLAND.

TERTIARY STRATA....

Loess FORMATION OF CHINA.

Fossil SPONGES........

RECENT FORMATION OF MINERALS..

ERUPTIVE ROCKS...

INTERNATIONAL GEOLOGICAL CONGRESS.

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HYDROGRAPHY. By FRANCIS M.GREEN, Lieutenant-Commander, U.S.N.. 313

GEOGRAPHY. By FRANCIS M. GREEN, Lieutenant-Commander, U.S.N.... 327

NORTH AMERICA.

327

GREENLAND....

335

CENTRAL AMERICA.

336

SOUTH AMERICA.

337

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AFRICA.....

MICROSCOPY. By Professor HAMILTON L. SMITH, Hobart College, Ge-

neva, N. Y......

355

IMPROVEMENTS IN MICROSCOPICAL OBJECTIVES AND MICROSCOPICAL

APPARATUS....

355

The New Oil-immersion Object-glass of Carl Zeiss..

355

Immersion Condensers..

356

A New Cover-adjustment for Microscopical Objectives.

357

Professor Abbe's Apertometer....

357

New Form of Micrometer.

359

New Test-object..

359

Self-centring Turn-table..

360

Theoretical Limit of Aperture...

361

MICRO-ORGANISMS, BACTERIA GERMS, SPORES, ETC..

301

Anaerobiosis of Micro-organisms.....

361

Organisms Suspended in the Atmosphere..

362

Schulze's Mode of Intercepting the Germinal Matter of the Air.. 363

Action of very Low Temperatures on Bacteria....

364

Staining and Preparation of Bacteria....

361

Examining, Preserving, and Photographing Bacteria...

365

Measurement of the Diameter of the Flagella of Bacterium Termo. 366

Life History of a Minute Septic Organism..

367

Bacteria in Splenic Disease......

367

INFUSORIA, DIATOMS, RADIOLARIA, ETC...

307

Trembley's Experiments in Turning a Hydra Inside Out......... 367

The Foraminifera and Polycystina of the North Polar Expedition,

1875–76..

368

Radiolaria. .

368

Multiplication of Rhizopods..

368

Supposed Radiolarians and Diatomaceæ of the Coal-measures. 369

Revivification of Diatoms...

369

Parasites on a Diatom...

370

Diatoms in Colored Liquids..

371

Isthmia nervosa: a Study of its Modes of Growth and Reproduction. 371

TISSUE-STAINING, BLOOD, ETC...

372

Structure of the Colored Blood-corpuscles..

372

Rapid Staining by means of Carmine..

374

Gold-staining, and the Termination of the Nerves in the Cnstriated

Muscles..

374

MISCELLANEOUS..

375

New Acarus..

375

Insect Dissection.

375

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