London: Benjamin Franklin Stevens
4 Trafalgar Square Charing Cross

1882.

!

87

To CADWALLADER COLDEN.

Conjecture as to the Cause why Ships in crossing

the Atlantic have longer Passages in sailing west-

ward than in sailing eastward

74

CADWALLADER COLDEN TO B. FRANKLIN.

Answer to the foregoing Letter respecting the

Sailing of Ships across the Atlantic

76

To JARED Eliot. 16 July, 1747.

Linseed Oil. Northeast Storms.

Origin of

Springs in Mountains. — Petrified Shells in the

Appalachian Mountains. — Observations on a Tariff

Law

79

To JARED ELIOT.

Experiments in the Culture of Grass in Meadows 83

To THOMAS HOPKINSON. 1747.

On the Vis Inertiæ of Matter

To CADWALLADER COLDEN. 6 August, 1717.

Baxter's Book on the Vis Inertiæ of Matter.

Manufacture of Electrical Apparatus. — Colden's

Philosophical Treatise

93

A Conjecture as to the Cause of the Heat of the Blood

in Health, and of the Cold and Hot Fits of some

Fevers

97

To PETER COLLINSON.

Magical Square of Squares

100

To PETER COLLINSON.

Magical Circle

104

To JARED Eliot. 13 February, 1749-50.

Northeast Storms begin at the South. — Account

of a Copper Mine. — Subscriptions for an Acad-

eny in Philadelphia

105

To CADWALLADER COLDEN. 28 June, 1750.

Electrical Papers and Experiments. — James Logan 109

To JARED Elior. 25 October, 1750.

Inquiries respecting the Mode of Planting Hedges

To JARED Eliot. 10 December, 1751.

Remarks on Husbandry

112

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114

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118

120

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121

123

127

136

CADWALLADER COLDEN TO B. FRANKLIN. 20 May, 1752.

Concerning Theories of Light

John PERKINS TO B. FRANKLIN. 3 August, 1752.

Respecting the Number of Deaths in Boston oj

Inoculation

To John PERKINS. 13 August, 1752.

Concerning the Smallpox in Philadelphia

To CADWALLADER COLDEN. 14 September, 1752.

Remarks on Mr. Colden's Theory of Light. —

Translation of Electrical Papers into French

CADWALLADER COLDEN TO B FRANKLIN. 24 Oct. 1752.

Cause of the Cohesion of the Particles of Matter.

Concerning a Translation of a German Writer's Re-

marks on Mr. Colden's Philosophical Principles

Physical and Meteorological Observations, Conjectures, and

Suppositions

JOHN PERKINS TO B. FRANKLIN. 16 October, 1752.

On Water-Spouts

John PERKINS TO B. FRANKLIN. 23 October, 1752.

Further Remarks on Water-Spouts

W. MERCER TO B. FRANKLIN. 11 November, 1752.

Description of a Water-Spout at Antigua

To John PERKINS. 4 February, 1753.

Water-Spouts and Whirlwinds compared

To James BowDOIN. 28 February, 1753.

Relating to the Transit of Mercury in 1753

To Jared Eliot. 12 April, 1753.

Properties of Water. Notice of the Author's

Writings in France

John PERKINS TO B. FRANKLIN. 14 May, 1753.

Shooting Stars

John PERKINS To B. FRANKLIN.

Water-Spouts and Whirlwinds .

Observations on the Meteorological Paper; by a Gentleman

in Connecticut

Observations in Answer to the Foregoing; by B. Franklin

138

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143

145

159

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160

163

164

17)

174

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Observations on the Meteorological Paper ; sent by Cad-

wallader Colden to B. Franklin

177

Answer to the foregoing Observations ; by B. Franklin . 180

Extracts from Dampier's Voyages, relating to Water-Spouts 183

William SHERVINGTON TO B. FRANKLIN. 20 June, 1753.

On the Transit of Mercury across the Sun, May

6th, 1753, observed at Antigua

187

To THOMAS Clap. 8 November, 1753.
On Sineaton's Air Pump

138

JAMES BOWDOIN TO B. FRANKLIN. 12 November, 1753.

Concerning the Light in Sea-Water

190

M. DALIBARD TO B. FRANKLIN. 31 March, 1754.

Intelligence on Philosophical Subjects

193

CADWALLADER COLDEN TO B. FRANKLIN. 2 April, 1754.

Water-Spouts. — Wind generated by Fermenta-

tion.— Winds blowing in contrary Directions 195

CADWALLADER COLDEN TO B. FRANKLIN. 2 April, 1754.

New Theory of the Motion of the Planets best

suited for calculating Astronomical Tables.— Abbé

Nollet's Book

197

CADWALLADER COLDEN TO P. Collinson. 28 May, 1754.

On Water-Spouts

199

To PETER COLLINSON. 25 August, 1755.

Account of a Whirlwind in Maryland

201

To John LINING. 14 April, 1757.

On Cold produced by Evaporation

203

John BartRAM TO B. Franklin. 12 November, 1757.

Relating to a remarkable Aurora Borealis

211

To John Pringle. 6 January, 1758.

On the different Strata of the Earth

212

To John LINING. 17 June, 1758.

Experiment with Ether for producing Cold by

Evaporation. — Water kept cool in hot Countries.

--- The human Body cooled by Evaporation.

The Surface of the Earth and Vegetation cooled

in the same Manner

213

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