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E E 302

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1842 7095

via Entered, according to Act of Congress, in the year 1839, by

HARPER & BROTHERS, In the Clerk's Office of the Southern District of New-York.

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To Dr. Rush

199

To Miss Catharine Louisa Shipley : :

199

TO * * *

200

Copy of the last Letter written by Dr. Franklin

201

PHILOSOPHICAL SUBJECTS.

To the Abbé Soulavie.-Theory of the Earth

203

To Dr. John Pringle.-On the different Strata of the Earth 207

To Mr. Bowdoin.--Queries and Conjectures relating to Mag.

netism and the Theory of the Earth

208

To M. Dubourg.-On the Nature of Seacoal

21)

Causes of Earthquakes

212

To David Rittenhouse.- New and Curious Theory of Light

and Heat

224

of Lightning; and the Methods now used in America for

the securing Buildings and Persons from its mischievous

Effects

227

To Peter Collinson.-Electrical Kite :

231

Physical and Meteorological Observations, Conjectures, and

Suppositions

232

To Dr. Perkins.-'Water-spouts and Whirlwinds compared 240

To Alexander Small.-On the Northeast Storms in North

America

254

To Dr. Lining:-—on Cold produced by Evaporation 256

To Peter Franklin. On the Saltness of Seawater

263

To Miss Stephenson.-Salt Water rendered fresh by Distil.

lation.- lvethod of relieving Thirst by Seawater

264

To the same. -Tendency of Rivers to the Sea.- Effects of

the Sun's Rays on Cloths of different colours

266

To the same.-On the Effect of air on the Barometer, and

the Benefits derived from the Study of Insects

270

To Dr. Joseph Priestley.—Effect of Vegetation on Noxious

Air

273

To Dr. John Pringle.-On the Difference of Navigation in

Shoal and Deep Water

274

To Oliver Neale. -- On the Art of Swimming

277

To Miss Stephenson.-Method of contracting Chimneys.-

Modesty in Disputation

281

TO M. Dubourg

- Observations on the prevailing Docirines

of Life and Death

282

Lord Brougham's Portrait of Dr. Franklin :

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