particles of air, and be
supported by them; for in the vacancies there is nothing they can
Air and water mutually attract each other. Hence water will dissolve
in air, as salt in water.
The specific gravity of matter is not altered by dividing the
matter, though the superficies be increased. Sixteen leaden bullets,
of an ounce each, weigh as much in water as one of a pound, whose
superficies is less.
Therefore the supporting of salt in water is not owing to its
superficies being increased.
A lump of salt, though laid at rest at the bottom of a vessel of
water, will dissolve therein, and its parts move every way, till
equally diffused in the water; therefore there is a mutual attraction
between water and salt. Every particle of water assumes as many of
salt as can adhere to it; when more is added, it precipitates, and
will not remain suspended.
Water, in the same manner, will dissolve in air, every particle of
air assuming one or more particles of water. When too much is added,
it precipitates in rain.
But there not being the same contiguity between the particles of air
as of water, the solution of water in air is not carried on without a
motion of the air, so as to cause a fresh accession of dry particles.
Part of a fluid, having more of what it dissolves, will communicate
to other parts that have less. Thus very salt water, coming in
contact with fresh, communicates its saltness till all is equal, and
the sooner if there is a little motion of the water.
Even earth will dissolve, or mix with air. A stroke of a horse's hoof
on the ground, in a hot dusty road, will raise a cloud of dust, that
shall, if there be a light breeze, expand every way, till, perhaps,
near as big as a common house. It is not by mechanical motion
communicated to the particles of dust by the hoof, that they fly so
far, nor by the wind, that they spread so wide: but the air near
the ground, more heated by the hot dust struck into it, is rarefied
and rises, and in rising mixes with the cooler air, and communicates
of its dust to it, and it is at length so diffused as to become
invisible. Quantities of dust are thus carried up in dry seasons:
showers wash it from the air, and bring it down again. For water
attracting it stronger, it quits the air, and adheres to the water.
Air, suffering continual changes in the degrees of its heat, from
Virtue and Innocence, a Poem 1 0 The Economy of Human Life 1 0 Old Friends in a New Dress, or Selections from Esop's Fables, in Verse, 2 parts, plates 2 0 Little Jack Horner, in Verse, plain 1s.Page 2
However, let us hearken to good advice, and something may be done for us; "God helps them that help themselves," as Poor Richard says.Page 3
"He that hath a trade, hath an estate; and he that hath a calling, hath an office of profit and honour," as Poor Richard says; but then the trade must be worked at, and the calling well followed, or neither the estate nor the office will enable us to pay our taxes.Page 4
The diligent spinner has a large shift; and now I have a sheep and a cow, every body bids me good-morrow.Page 5
Poor Dick farther advises, and says, "Fond pride of dress is sure a very curse, Ere fancy you.Page 7
" [Illustration: Published by W.Page 8