-6316.4 4

4539.31.2

Entered according to the act of Congress, in the year one thousand eight hundred and thirty-eight, by HILLIARD, GRAY, AND CO., in the Clerk's Office of the District Court of the District of Massachusetts.

CONTENTS

OF

VOLUME SIXTH.

◇ LETTERS AND PAPERS ON PHILOSOPHICAL SUBJECTS.

Causes of Earthquakes. 15 December, 1737

A Proposal for promoting Useful Knowledge among the

British Plantations in America. 14 May, 1743 .

CADWALLADER COLDEN TO B. FRANKLIN. October, 1743.

A New Method of Printing

To CADWALLADER COLDEN. 4 November, 1743

CADWALLADER COLDEN TO W. STRAHAN. Nov. 1743.

Remarks on a New Method of Printing.

To CADWALLADER COLDEN. 5 April, 1744.

Organization of a Philosophical Society

9 May, 1744.

WILLIAM STRAHAN TO C. COLDEN.

Objections to the proposed New Method of Printing

CADWALLADER COLDEN TO B. FRANKLIN. Dec. 1744.

Concerning Thoughts on different Species of Mat-

ter. Suggestion for publishing Philosophical Pa-

pers

-

Page

1

14

18

25

26

28

29

32

34

An Account of the new-invented Pennsylvanian Fire-places

TO CADWALLADER Colden. 15 August, 1745.

On Perspiration and Absorption.- Motion of the

Blood in the Heart

65

To CADWALLADER COLDEN. 28 November, 1745.

On the Circulation of the Blood.- Proposal for

publishing a Philosophical Miscellany

70

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 .

CADWALLADER COLDEN TO B. FRANKLIN.

Answer to the foregoing Letter respecting the

Sailing of Ships across the Atlantic

TO JARED ELIOT. 16 July, 1747.

Linseed Oil. Northeast Storms.

-

74

76

-

Origin of

Springs in Mountains. - Petrified Shells in the

Appalachian Mountains. Observations on a Tariff

Law

79

Baxter's Book on the Vis Inertia of Matter.

Manufacture of Electrical Apparatus. - Colden's

Philosophical Treatise

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

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

Fevers

TO PETER COLLINSON.

Magical Square of Squares

TO PETER COLLINSON.

Magical Circle

TO JARED ELIOT. 13 February, 1749-50.

93

97

100

104

TO CADWALLADER COLDEN. 28 June, 1750.

-

Northeast Storms begin at the South. Account

of a Copper Mine. Subscriptions for an Acad-

emy in Philadelphia

105

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 by

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.

TO JAMES BOWDOIN. 28 February, 1753.

Water-Spouts and Whirlwinds compared

Relating to the Transit of Mercury in 1753

To JARED ELIOT. 12 April, 1753.

114

118

120

121

136

143

145

159

Water-Spouts and Whirlwinds.

Observations on the Meteorological Paper; by a Gentleman

Observations in Answer to the Foregoing; by B. Franklin

VOL. VI.

A*

Observations on the Meteorological Paper; sent by Cad-

wallader Colden to B. Franklin

.

Answer to the foregoing Observations; by B. Franklin.

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

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

On the Transit of Mercury across the Sun, May

6th, 1753, observed at Antigua

177

180

183

187

TO THOMAS CLAP. 8 November, 1753.

On Smeaton's Air-Pump

188

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

190

Concerning the Light in Sea-Water

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

Intelligence on Philosophical Subjects

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

Water-Spouts. Wind generated by Fermenta-

tion. Winds blowing in contrary Directions

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

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

On Water-Spouts

TO PETER COLLINSON. 25 August, 1755.

Account of a Whirlwind in Maryland

TO JOHN LINING. 14 April, 1757.

On Cold produced by Evaporation

JOHN BARTRAM TO B. FRANKLIN. 12 November, 1757.

Relating to a remarkable Aurora Borealis

TO JOHN PRINGLE. 6 January, 1758.

On the different Strata of the Earth

TO JOHN LINING. 17 June, 1758.

193

195

197

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