the Method of Erecting Conductors of Lightning 424

To EDWARD NAIRNE. 13 November, 1780.

Proposing a slowly sensible Hygrometer for cer-

tain Purposes

TO THE MARQUIS TURGOT. 1 May, 1781.

On a new-invented Stove

TO FELIX VICQ D'AZYR. 20 July, 1781.

On the Long Retention of Infection in Dead

Bodies after Sepulture

FELIX VICQ D'AZYR TO B. FRANKLIN. 23 Aug. 1781

TO JOHN INGENHOUSz. 2 October, 1781.

On Conductors of Heat

An Account of Toads found enclosed in Solid Stone

TO THE ABBÉ SOULAVIE. 22 September, 1782.

On the Theory of the Earth

JOHN INGENHOUSZ TO B. FRANKLIN. 29 Nov. 1782.

Experiment for burning Wire

TO DAVID RITTENHOUSE. 15 December, 1783.
On the Comet seen in Yorkshire

EDWARD NAIRNE TO B. FRANKLIN. 2 Dec. 1783.

A Hygrometer on a New Construction. M. De

Luc's Hygrometer

-

TO JOHN INGENHOUSZ. 16 January, 1784.

On Balloons, and their probable Importance

TO BENJAMIN VAUGHAN. 29 April, 1784.

Fire supposed to exist in the State of a Subtile

Fluid

426

432

433
437

438

441

443

448

449

451

Meteorological Imaginations and Conjectures. May, 1784

Loose Thoughts on a Universal Fluid. 25 June, 1784

TO JOHN INGENHOUSZ, 29 April, 1785.

Clock with three Wheels. Gravitation of Bodies 461

TO DAVID LE ROY. August, 1785.

Improvements in Navigation. Observations on

the Sails and Cables of Vessels; the Models for

their Construction; Means of preserving them

from Accidents at Sea; Methods of giving Mo-

tion to Boats. — Gulf Stream. Precautions to

-

452

454
455

458

those who are about to take a Voyage at Sea.

-General Reflections on Navigation

Appendix to the above Letter. Remarks upon the Nav-

igation from Newfoundland to New York

To JOHN INGENHOUSZ. 28 August, 1785.

On the Causes and Cure of Smoky Chimneys

Description of a new Stove for burning Pitcoal, and con-

suming all its Smoke

Description of an Instrument for taking down Books from

high Shelves. January, 1786

TO BENJAMIN VAUGHAN. 31 July, 1786.

On the Effects of Lead upon the Human Con-

stitution

On Thermometers. 13 September, 1786

WILLIAM HERSCHEL TO B. FRANKLIN. 18 Feb. 1787.

With a Catalogue of new Nebula and Clusters

of Stars

To M. LE ROY. 18 April, 1787.

On Balloons. — Pigeons killed by Lightning

NEVIL MASKELYNE TO B. FRANKLIN. 3 March, 1788.

Concerning Churchman's Theory of the Varia-

ation of the Magnetic Needle .

TO JAMES BOWDOIN. 31 May, 1788.

Queries and Conjectures relating to Magnetism

and the Theory of the Earth

Description of the Process to be observed in making

large Sheets of Paper in the Chinese Manner,

with one smooth Surface

463

496

505

543

562

564

567

569

570

571

574

577

LETTERS AND PAPERS

ON

PHILOSOPHICAL SUBJECTS.