CONTENTS.

Report of the Secretary, Professor Henry, for 1868....

REPORT OF THE SECRETARY.

Resolutions of Congress ordering report to be printed..........

Letter of the Secretary to Congress..

Letter of the Chancellor and Secretary, submitting report for 1868...
Officers and Regents of the Institution.....

Members, cx officio, and honorary members of the Institution...
Programme of organization.............

Report of the Assistant Secretary, Professor Baird, for 1868..

Page.

234

5

6

7

12

54

List of Smithsonian meteorological stations and observers in North America and adja-
cent islands, from 1849 up to the end of the year 1868.....
Alphabetical list of meteorological observers of the Smithsonian Institution up to the
end of the year 1868....

68

86

Meteorological material contributed in addition to the regular observations, during the year 1868.....

Notice of Christian Frederic Schoenbein, the discoverer of Ozone....

Recent progress in relation to the theory of heat, by A. Cazin..............

231

Principles of the mechanical theory of heat, by Dr. John Muller......

245

Continuous vibratory movement of all matter, ponderable and imponderable, by L.

Magrini.....

281

Radiation, by John Tyndall....

292

Synthetic experiments relative to meteorites, approximations to which these experiments lead, by M. Daubrée....

312

Catalogue of meteorites in the mineralogical collection of Yale College...
Observations on the electric resonance of mountains, by Henry de Saussure...
Experiments on aneroid barometers made at the Kew Observatory, by B. Stewart....
Anniversary Address of the President of the Royal Society of Victoria, by R. L. J
Ellery...

342

345

350

354

Report on the transactions of the Society of Physics and Natural History of Geneva, from June, 1867, to June, 1868, by Professor Eliè Wartmann..

364

History of the transactions of the Anthropological Society of Paris, from 1865 to 1867, by M. Paul Broca......

376

Drilling in stone without metal. By Chas. Rau.....

392

A deposit of agricultural flint implements in southern Illinois. By Chas. Rau.......
Notice of the Blackmore Museum, Salisbury, England......
Programme of the Holland Society of Sciences of Harlem, 1869
Programme of the Imperial Academy of Sciences, Belles Lettres, and Arts, of Bordeaux.
A brief account of the processes employed in the assay of gold and silver coins at the
mint of the United States. From the annual report of James Pollock, director....
A statement of foreign gold and silver coins, prepared by the director of the mint, to
accompany his annual report

List of publications of the Smithsonian Institution up to end of 1868, with systematic
and alphabetical index......

Page.

401

408

414

419

422

426

429

Mechanical equivalent of heat, Fig. 8.

Elements of the mechanical theory of heat, Fig. 9....

Application of the mechanical theory of heat to aqueous vapors, Fig. 10.
Application of the mechanical theory of heat to aqueous vapors, Fig. 11
Action of saturated steam under expansion, Fig. 12..

Melting of ice, Fig. 13.....

253

260

263

266

271

273

Melting of ice, Fig. 18.

Radiation, (one cut).

Drilling in stone without metal, Fig. 1..
Drilling in stone without metal, Fig. 2.

Drilling in stone without metal, Fig. 3..
Drilling in stone without metal, Fig. 4.
Drilling in stone without metal, Fig. 5..
Drilling in stone without metal, Fig. 6..
Drilling in stone without metal, Fig. 7..
Drilling in stone without metal, Fig. 8.....
Drilling in stone without metal, Fig. 9
Drilling in stone without metal, Fig. 10
Drilling in stone without metal, Fig. 11

...

274

299

393

393

393

394

395

395

396

397

398

399

399

Agricultural flint implements in southern Illinois, (plan of locality)...
Agricultural flint implements in southern Illinois, Fig. 3...................
Agricultural flint implements in southern Illinois, Fig. 4.

403

404

405