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.

426

432

On the Long Retention of Infection in Dead

Bodies after Sepulture

433

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

To JOHN INGEN HOUSZ. 2 October, 1781.

437

An Account of Toads found enclosed in Solid Stone

TO THE ABBÉ SOULAVIE. 22 September, 1782.

441

On the Theory of the Earth.

443

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

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

A Hygrometer on a New Construction. M. De

Luc's Hygrometer

TO DAVID RITTENHOUSE. 15 December, 1783.

449

Fire supposed to exist in the State of a Subtile

Fluid

454

Meteorological Imaginations and Conjectures. May, 1784

Loose Thoughts on a Universal Fluid. 25 June, 1784

TO JOHN INGENHOUSZ. 29 April, 1785.

455

458

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

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.

463

496

505

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

562

564

567

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 :

569

570

571

574

577

LETTERS AND PAPERS

ON

PHILOSOPHICAL SUBJECTS.