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THE
WORKS
OF
BENJAMIN FRANKLIN;
CONTAINING
SEVERAL POLITICAL AND HISTORICAL TRACTS
NOT INCLUDED IN ANY FORMER EDITION,
AND
MANY LETTERS OFFICIAL AND PRIVATE
NOT HITHERTO PUBLISHED:
WITH
NOTES
A LIFE OF THE AUTHOR.
BY JARED SPARKS.
VOLUME VI
REVISED EDITION.
PHILADELPHIA:
CHILDS & PETERSON, 602 ARCH ST.
200.9.6. 270.
a. 100
Entered according to act of Congress, in the year 1840, by
HILLIARD, GRAY & CO.
in the Clerk's Office of the District Court of the District of Massachusetts.
BODE
CONTENTS
ог
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.
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
WILLIAM STRAHAN TO C. COLDEN. 9 May, 1744.
Page
1
14
18
25
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
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
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
TO JARED ELIOT.
Experiments in the Culture of Grass in Meadows
TO THOMAS HOPKINSON. 1747.
On the Vis Inertia of Matter
To CADWALLADER COLDEN. 6 August, 1747.
Baxter's Book on the Vis Inertia of Matter.
Manufacture of Electrical Apparatus.
79
83
87
· Colden's
93
A Conjecture as to the Cause of the Heat of the Blood
in Health, and of the Cold and Hot Fits of some
TO JARED ELIOT. 13 February, 1749-50.
Northeast Storms begin at the South.-Account
of a Copper Mine.- Subscriptions for an Acad-
emy in Philadelphia
TO CADWALLADER COLDEN. 28 June, 1750.
105