INTERESTING PHILOSOPHICAL FACTS.
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Sound travels at the rate Of ll42 feet per
second in air, 1860 feet in water, 900 in cast
iron, $4,000 in steel, $4,000 in glass and from 4,
636 to 1900 in wood.


Mercury freezes at SO degrees below Q, Fab
renheit, and becomes solid mass, malleabe un-
der the hammer.


The greatest heighth at which visible clouds
eyer exist, does not exceed ten miles.


Air is about SIC times lighter than water.


The pressure Of the atmosphere upon every
square foot Of the earth, amounts to 2l6O pounds.
Al ordinary sized man, supposng his surface to
be IA square feet, sustains the enormous pressure
of3O, ,24o. !.


Heat rarefes the air to such an extent that it
can Be made to occupy 5-or 600 times the space
it did before. r.


The violence of water when freezing, is sutfl-
Gent to cleaye globe of copper of such thick
ness as to require force of $4,000 pounds to
produce the same effect. . 80


During the conversion of ice into water, LAY
decress Of heat are absorbed.


Water when converted into steam, increases IN
bulk 1900 times.