OF THE

PHILOSOPHICAL SOCIETY

OF

WASHINGTON.

VOL. XI.

WITH THE CONSTITUTION, RULES,

AND LISTS OF

OFFICERS AND MEMBERS.

TADZANA UNIVERSITY

Main
WASHINGTON:

PRINTED BY JUDD & DETWEILER.

1892. an

Philosophy and Specialties, Annual Presidential Address, 1888,

Garrick Mallery....

On the Observation of Sudden Phenomena, S. P. Langley.

3

41

On Some of the Greater Problems of Physical Geology, C. E. Dutton..

On the Crystallization of Igneous Rocks, J. P. Iddings.

On the Reduction of Pendulum Observations, E. D. Preston..

The Relative Abundance of the Chemical Elements, F. W. Clarke... 131

Assumption and Fact in the Theories of Solar and Stellar Proper Mo-

tions, Annual Presidential Address, 1889, J. R. Eastman.

Hurricanes in the Bay of North America, Everett Hayden.

The Mineral Composition and Geological Occurrence of Certain Igne-

ous Rocks in the Yellowstone National Park, J. P. Iddings.

The Evolution of Serials Published by Scientific Societies, W J

McGee....

51

65

115

143

173

191

......

221

247

275

On Certain Peculiar Structural Features in the Foot-Hill Region of

the Rocky Mountains near Denver, Colorado, G. H. Eldridge...

The Progress of Meteoric Astronomy in America, J. R. Eastman..

Money Fallacies, Annual Presidential Address, 1890, C. E. Dutton.... 359

Constitution and Origin of Spherulites in Acid Eruptive Rocks,

Whitman Cross..

Spherulitic Crystallization, J. P. Iddings.

Obituary Notices...

Mohawk Lake Beds, H. W. Turner.

Minutes of Proceedings of the Society, 1888.

Minutes.of Proceedings of the Society, 1889.

Minutes of Proceedings of the Society, 1890.

Minutes of Proceedings of the Society, 1891..

Minutes of Proceedings of the Mathematical Section, 1888.

Minutes of Proceedings of the Mathematical Section, 1889.

Minutes of Proceedings of the Mathematical Section, 1890.

Minutes of Proceedings of the Mathematical Section, 1891

Index.

411

445

465

385

499

528

549