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Philosophical Fdds.--Solnd travels at the rate of llA2 feet per second in air, 4960 feet in water 11090 in cast iron, 1000 in steel, l8000 in glass, and 4636 to l7000 in wood. sDfsaff.-i.. ..,-,., !. gsil

 The pressure of the atmosphere upon every square foot of the earth amounts to 2160 pounds. Arextra- ordinary sized man, supposing his surface D be, IA square eet sustains the enormous pressure of pounds. .,.. 4. 1F..'

 Heat rarifes air to such extent, that il may be made to occupy or 600 times the space it did be- fre. s,sIi s. l4a

 The violence of the expansion of ,sasr when free.- ing is sufficient to ceave glsbe of copper of such thickness as to require force of 1000 pounds to produce the same effect.