.

Vol. Page. * Letter from Celia Single

II. 536 * On Scandal

II. 539 * A Case of Casuistry

II. 545 * Miscellaneous Observations

II. 549 * Proposals and Queries for the Consideration of the Junto

II. 551 1735. Self-denial not the Essence of Virtue

II. 63 On the Usefulness of the Mathematics

II. 66 On True Happiness

II. 70 1736. On Discoveries

II. 73 The Waste of Life

II.

77 Necessary Hints to those that would be Rich

80 + The Way to make Money Plenty in every Man's Pocket.

II. 82 * Address to the Readers of Poor Richard's Almanac II. 85 On Government

II. 278 1737. On Freedom of Speech and the Press

II. 285 Causes of Earthquakes

. VI. 1

1742. Rivalship in Almanac-Making .

II. 83 Rules of Health

II. 86

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1743. * Proposal for promoting Useful Knowledge among the British Plantations in America.

VI. 14

1744. * Organization of a Philosophical Society

VI. 28 An Account of the new-invented Pennsylvania Fireplaces

VI. 34 1745. On Perspiration and Absorption, and the Motion of Blood in the Heart .

VI. 65 I On the Circulation of the Blood

. VI. 70

.

Vol. Page. Conjecture as to the Cause why Ships in crossing the

Atlantic have longer Passages in sailing westward,
than in sailing eastward

• VI. 74

1747.
*Plain Truth ; or Serious Considerations on the pres-

ent State of the City of Philadelphia and Province
of Pennsylvania

III. 1 Northeast Storms; Origin of Springs in Mountains ;

petrified Shells in the Appalachian Mountains ;
Observations on a Tariff

VI. 79 | Experiments on the Culture of Grass

VI. 83 On the Vis Inertiæ of Matter

VI. 87 IA Conjecture as to the Cause of the Heat of the

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

VI. 97 First Letter to Peter Collinson on the Subject of Elec

tricity; Wonderful Effect of Points ; Positive and
Negative Electricity

V. 181 Observations on the Leyden Bottle, with Experiments V. 189

1748. Advice to a Young Tradesman

II. 87 Further Experiments on Electricity

V. 196 Observations and Suppositions towards forming a new

Hypothesis for explaining the several Phenomena
of Thunder-gusts

V. 211 1749. * Proposals relating to the Education of Youth in Pennsylvania

1. 569 Sketch of an English School, for the Consideration of the Trustees of the Philadelphia Academy

II. 125 Magical Square of Squares

VI. 100 Magical Circle

VI. 104

1750. Electrical Experiments; Effect of Lightning on the Needle of Compasses explained

V. 223 Opinions and Conjectures concerning the Properties

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Vol. Page.
Means of preserving Buildings and Ships from
Lightning

V. 227 Additional Experiments in Electricity

V. 253 Account of an Accident while making an Electrical Experiment

V. 255 Reasons why Northeast Storms begin at the South VI. 105 Electrical Papers and Experiments

VI. 109 | Inquiries respecting the Mode of planting Hedges VI. 111

1751. Observations concerning the Increase of Mankind, and the peopling of Countries

II. 311 Unlimited Nature of Electric Force

V. 258 Queries and Answers on the Properties of Electricity V. 259 Remarks on Husbandry

VI. 112

1752. Observations on Electricity, and the Sources and Properties of Lightning ·

V. 269 Probable Causes of the different Attractions and Repulsions of two Electrified Globes

V. 275 Reasons for supposing that a Glass Globe charges positively and a Sulphur Globe negatively

V. 280 Supposition of a Region of Electric Fire above the

Atmosphere ; Theorem concerning Light . V. 283 Electrical Kite

V. 295 Concerning the Smallpox in Philadelphia

VI. 120 | Remarks on Mr. Colden's Theory of Light

VI. 121 Physical and Meteorological Observations, Conjectures, and Suppositions

VI. 127

1753. On the Mode of Coating Electrical Jars .

V. 299 An Account of various Electrical Experiments, with Remarks and Explanations

V. 300 On the Motion of the Electrical Fluid in Metals V. 317 Concerning the Light emitted by Salt Water

V. 337 Water-Spouts and Whirlwinds Compared

VI. 145 | Transit of Mercury in 1753 .

VI. 159 | Properties of Water

VI. 160 Reply to Mr. Todd's Observations on a Meteorological Paper

VI. 174

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.

Vol. Page Reply to Mr. Colden's Observations

VI. 180 1 On Smeaton's Air Pump

VI. 188

1754. Papers relating to a Plan of Union of the Colonies,

adopted by Commissioners assembled at Albany III. 22 Three Letters to Governor Shirley

III. 56 Plan for settling two Western Colonies in North America, with Reasons for the Plan .

III. 69 Additional Proofs of the Positive and Negative State of Electricity in the Clouds

V. 340 1755. * An Act for the better Ordering and Regulating such

as are willing and desirous to be united for Military
Purposes in Pennsylvania

III. 78 * Dialogue respecting the State of Affairs in Pennsylvania

III. 84 Experiments in Electricity, with Explanations

V. 341 Turkey killed by Electricity ; Effects on the Operator V. 346 Miscellaneous Remarks on Electricity and Lightning V. 347 Pointed Rods; Effect of Lightning on the Church at Newbury

V. 355 Account of a Whirlwind in Maryland

VI. 201

1756. * Plan for saving One Hundred Thousand Pounds II. 89

1757. The Way to Wealth ; being a Summary of the Maxims and Proverbs in Poor Richard's Almanac

II. 92 Observations on Mayz, or Indian Corn

II. 103 Report of the Committee of Aggrievances of the As

III. 97 sembly of Pennsylvania On the Effects of Electricity in Paralytic Cases V. 359 On Cold produced by Evaporation

VI. 203

1758. Electrical Apparatus ; Description of a Battery . V. 361 On the different Strata of the Earth .

VI. 212 Experiments and Remarks respecting Cold produced by Evaporation

VI. 213

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sonable creatures, when they build for themselves combustible dwellings, in which they are every day obliged to use fire. In my new buildings, I have taken a few precautions, not generally used; to wit, none of the wooden work of one room communicates with the wooden work of any other room; and all the floors, and even the steps of the stairs, are plastered close to the boards, besides the plastering on the laths under the joists. There are also trap-doors to go out upon the roofs, that one may go out and wet the shingles in case of a neighbouring fire. But, indeed, I think the staircases should be stone, and the floors tiled as in Paris, and the roofs either tiled or slated.

I am much obliged to your friend and neighbour Mr. Lathrop, for his kind present, and purpose writing to him. It is a discourse well written.

I sent you lately a barrel of flour, and I blame myself for not sooner desiring you to lay in your winter's wood, and drawing upon me for it as last year. But I have been so busy. To avoid such neglect in future, I now make the direction general, that you draw on me every year for the same purpose.

Adieu, my dear sister, and believe me ever your affectionate brother,

B. FRANKLIN.

TO M. DUBOURG.*

On the Nature of Sea Coal.

I am persuaded, as well as you, that the sea coal has a vegetable origin, and that it has been formed

This extract is translated from the French, as printed in M. Dubourg's edition of the author's writings. Its date is uncertain, but it was probably written about the year 1770, and should have been inserted among the philosophical papers of that period.