COLOR OF THE HEAVENS.
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If there were DO atmosphere the sky would appear black. Since the earth is surrounded by an atmosphere transparent and colourless, it is asked why the heavens appear blue. Mrs. Bryan says, that the rays of light from the sun strike upon the earth and are reflected back, that the ve- locity of reflected light is diminished, and that of blue rays is least of all. The mo- mentum of blue is so small, that they can not rise through the atmosphere, and being impeded, they are reflected iD different directions, so that to whatever part of the heavens we turn our eyes, only the blue rays meet them.

 A writer in the last number of Silliman's J~urnal, gives the following explanation, which is much more simple, and for that reason more profitable. He conceives it to be occasioned by looking at the dark vaucity beyond the atmosphere through the illuminated medium. The blackncss which would be seen ifthcre were DO atmosphere is seen thro' transparent medium, which gives it bluish tinge. When the atmos- phere is clearest, or freest from vapor, the heavens are of darker Cor if we may so say) ofa blacker blue.-iSch0k0r's Jour.