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kinds of exercise, I have thought that the quantum of each is to be judged of, not by time or by distance, but by the degree of warmth it produces in the body: thus, when I observe if I am cold when I get into a carriage in a morning, I may ride all day without being warmed by it; that if on horseback my feet are cold, I may ride sotne hours before they become warm; but if I am ever so cold on foot, I cannot walk an hour briskly, without glowing from head to foot by the quickened circulation: I have been ready to say, (using round numbers without regard to exactness, but merely to make a great- difference) that there is more exercise in one mile's riding on horseback, than in Jive-in a coach ; and more in one mile's walking on foot, than in Jive on horseback; to which 1 may add, that there is more in walking one mile up and down stairs, than in five on a level floor The two latter exercises may be had within doors, when the weather discourages going abroad; and the last may be had when one is pinched for time, as containing a great quantity of exercise in a handful of minutes. The dumb bell is another exercise of the latter compendious kind; by the use of it I have in forty swings quickened my pulse from sixty to one hundred beats in a minute, counted by a second watch; and I suppose the warmth generally increases with quickness of pulse.

B. Franklin.

To Mr. Anthony Benezet,1 Philadelphia.
Oh the Slave%Trade.

Dear Friend, London, August 22, 1772.

I made a little extract from yours of April 27, of the number of slaves imported and perishing, with some

1 An American philanthropist. In 1767, he wrote a Caution to Great Britain and her Colonics, in a short representation of the cala

close remarks on the hypocrisy of this country, which encourages such a detestable commerce by laws for promoting the Guinea trade; while it piqued itself on its virtue, love of liberty, and the equity of its courts in setting free a single negro. This was inserted in the London Chronicle of the 20/A of June last.—I thank you for the Virginia address, which f shall also publish with some remarks. I am glad to hear that the disposition against keeping negroes grows more general in North America. Several pieces have been lately printed here against the practice, and I hope in time it will be taken into consideration and suppressed by the legislature. Your labors have already been attended with great effects: I hope therefore you and your friends will be encouraged to proceed: my hearty wishes of success attend you, being ever, my dear friend,

Yours affectionately, B. Franklin.

To Dr. Priestley. Moral Algebra, or Method of deciding doubtful Matters with oneself.

Dear Sir, London, September 19, 1772.

In the affair of so much importance to you, wherein you ask my advice, I cannot, for want of sufficient premises, counsel you what to determine; but if you please, I will tell you how. When those difficult cases occur, they are difficult chiefly because, while we have them under consideration, all the reasons pro and cow are not present to the

mitous state of the enslaved negroes in the British dominions. In 1773, he published Historical Accounts of Guinea; with an Inquiry into the Rise and Progress of the Slave-Trade, its nature and lamentable effects. This amiable man seemed to have nothing else at heart but the good of his fellow-creatures; and the last act of his rife was to take from his desk six dollars for a poor widow.

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mind at the same time; but sometimes one set present themselves; and at oiher times another, the first being out of sight. Hence the various purposes or inclinations that alternately prevail, and the uncertainty that perplexes us. To get over this, my way is, to divide half a sheet of paper by a line into two columns: writing over the one pro, and over the other con; then during three or four days' consideration, I put down under the different heads, short hints of the different motives that at different times occur to me, for or against the measure. When I have thus got them all together in one view, I endeavor to estimate their respective weights, and where I find two, (one on each side) that seem equal, I strike them both out. If I find a reason pro equal to some two reasons cow, I strike out the three. If I judge some two reasons con equal to some three reasons pro, I strike out the five; and thus proceeding, I find at length where the balance lies; and if after a day or two of farther consideration, nothing new that is of importance occurs on either side, I come to a determination accordingly. And though the weight of reasons cannot be taken with the precision of algebraic quantities, yet, when each is thus considered separately and comparatively, and the whole lies before me, I think I can judge better, and am less liable to make arash step; and in fact I have found great advantage from this kind of equation, in what may be called moral or prudential algebra.

Wishing sincerely that you may determine for the best, i am ever, my. dear friend,

yours most affectionately, £.-frankli». To The Rev. Dr. Mather.

Dissenters' Petition.America known to the Europeans before Columbus.

Reverend Sir, London, July 7, 1773.

By a line of the 4th past, I acknowledged the receipt of jour favor of March 18, and sent you with it two pamphlets. I now add another, a spirited address to the bishops who opposed the dissenters' petition. It is written by a dissenting minister at York. There is preserved at the end of it, a little fugitive piece of mine on the same occasion.

I perused your tracts with pleasure: I see -you inherit all the various learning of your famous ancestors, Cotton and Increase Mather. The father Increase, I once heard preach at the Old South Meeting for Mr. Pemberton; and remember his mentioning the death of "that wicked old persecutor of God's people, Lewis the XIV";" of which news had just been received; but which proved premature. I was some years afterwards at his house at the north end on some errand to him, and remember him sitting in an easy chair apparently very old and feeble. But Cotton I remember in the vigor of his preaching and usefulness.

You have made the most of your argument, to prove that America might be known to the ancients. There is another discovery of it claimed by the Norwegians, which you have not mentioned, unless it be under the words " of old viewed and observed," page 7. About twenty-five years since, Professor Kalm, a learned Swede, was with us in Pennsylvania. He contended, that America was discovered by their northern people, long before the time of Columbus; which 1 doubting, he drew up and gave me some time after, a note of those discoveries, which I send you enclosed.1 It is his own handwriting, and his own English; ?ery intelligible for the time

1 This paper is wanting. We subjoin, however, another account of the discovery of America, which lias lately appeared.

Brussells, Dec. 4, 1816.

In the last number of the Magazine for the Sciences, Arts, and Letters, published in Dutch at Amsterdam, it is proved from new documents that are very authentic, that it is not to Columbus or to Vespatius that we owe the discovery of America, but to Martin Behens, a native of Nuremberg in Franconia. He was a most learned geographer, astronomer, and navigator. He sailed in 1459, with a vessel equipped by the orders of Isabella, daughter of John II., King of Portugal, who was at that time governess of Burgundy and Flanders. He first discovered Fayal, with the adjacent islands called the Azores, which bore for a long time the name of the " Isle of the Flemings.'' He inhabited for 2d years that city, where he established a colony of Flemings. Eight years before the expedition of Columbus, in 1484, he secretly applied to John II., who equipped a flotilla to give him all kinds of succors. Behens first discovered the Brazils, penetrated as far as the Straits of Magellan, and visited the country inhabited by the Patagonians. He made a map of his discoveries, delivered it to the King, and sent a copy of it to Nuremberg, his native city, where it is still preserved in the archives of the city. It was after the inspection of this map that Columbus undertook his expedition.—(From the Journal de la Belgique, Dec. 5,1816.)

The honor of this discovery has also been claimed by the Icelanders.

"The Icelandic chronicles or annals, are in general very exact in relating their maritime expeditions in the northern seas, and even in. preserving the adventurers' names. The following account stands ou the testimony of Torsseus, and Angrim Jonas, two writers of undoubted credit, who have faithfully copied the old historians of their country.

"' There was,' say they, 'an Icelander, named Iferiol, who, with his son Biarn, made every year a trading voyage to different countries, and generally wiutered in Norway. Happening in the year 1001, to

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