The Complete Works in Philosophy, Politics and Morals of the late Dr. Benjamin Franklin, Vol. 2 [of 3]

By Benjamin Franklin

Page 72

which evaporating, and
the fluid part drying away in a course of years, would leave the salt
covering the bottom; and that salt coming afterwards to be covered
with earth, from the neighbouring hills, could only be found by
digging through that earth. Or, as we know from their effects, that
there are deep fiery caverns under the earth, and even under the
sea, if at any time the sea leaks into any of them, the fluid parts
of the water must evaporate from that heat, and pass off through
some volcano, while the salt remains, and by degrees, and continual
acretion, becomes a great mass. Thus the cavern may at length be
filled, and the volcano connected with it cease burning, as many
it is said have done; and future miners, penetrating such cavern,
find what we call a salt-mine. This is a fancy I had on visiting
the salt-mines at Northwich, with my son. I send you a piece of the
rock-salt which he brought up with him out of the mine. ****

I am, Sir, &c.

B. FRANKLIN.

FOOTNOTE:

[17] Peter Franklin. _Editor._




TO MISS STEPHENSON.

_On the Effect of Air on the Barometer, and the Benefits derived
from the Study of Insects._


_Craven Street, June 11, 1760._

'Tis a very sensible question you ask, how the air can affect the
barometer, when its opening appears covered with wood? If indeed it
was so closely covered as to admit of no communication of the outward
air to the surface of the mercury, the change of weight in the air
could not possibly affect it. But the least crevice is sufficient
for the purpose; a pinhole will do the business. And if you could
look behind the frame to which your barometer is fixed, you would
certainly find some small opening.

There are indeed some barometers in which the body of mercury at the
lower end is contained in a close leather bag, and so the air cannot
come into immediate contact with the mercury; yet the same effect is
produced. For the leather being flexible, when the bag is pressed by
any additional weight of air it contracts, and the mercury is forced
up into the tube; when the air becomes lighter, and its pressure
less, the weight of the mercury prevails, and it descends again into
the bag.

Your observation on what you have lately read concerning insects is
very just and solid. Superficial minds are apt to despise those who
make that part of the creation their study, as mere triflers; but
certainly the world has been

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Text Comparison with A Book of Gems Choice selections from the writings of Benjamin Franklin

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Giving up Principles 397 Glorying in the Cross of Christ 439 Hardening Pharaoh’s Heart 15 Hear ye Him 123 How a Preacher may Stand Fair 281 How the Cause of Reformation was Advanced 391 How the World Regards Dancers 297 Household Baptisms 433 Imperfect Medium for a Perfect Revelation 482 Individuality after Death 369 Infant Sin—Infant Salvation 108 Influence of the Dance 245 Innovations in the Church of Christ 413 In Season and out of Season 38 Is.
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We will call no man _Reverend_.
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PROGRESSING BACKWARD.
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Here stands Moses, the Law-giver of ancient Israel, and recognizes the Lord Jesus Christ, and surrenders up all authority to him.
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Anciently, when a doctrine was preached which the people did not believe, they were.
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There never was a Methodist before John Wesley.
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Those of us who have taken it can stand by and maintain it, on the one hand, or depart from it on the other.
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This is our security against the evil of covetousness.
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_ But how did so large an estate accumulate if he did not love money, or love “filthy lucre?” We answer that a large amount of his estate came to him as he explained to us, when we visited him, in the only conversation we ever had with him about his temporal affairs, and that a very brief one.
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Certain other matters are so self-evident, that they need only to be well stated to satisfy any ordinary mind.
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It is the power of God to save men.
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Should the plan be successful, the whole Series when complete, will form a unique and valuable addition to the libraries of wide-awake religious people.
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His career as a writer is given, his connection with the various questions that presented themselves as matter of controversy with the denominations and among the disciples, his positions, changes and arguments are presented with fairness.