The drops of rain :vary in their size, perhaps from one twenty-fifth to one-fourth of an inch in diameter. In parting from the clouds, they precipitate their descent till the increasing resistance, opposed by the air, becomes equal to their weight, when they continue to fall with a uniform velocity, which is therefore, in a certain ratio to the diameter of the drops; hence thunder and other skowers, in which the drops are large, pour down faster than a drizzling rain. A drop of the twenty-fifth part of an inch, in falling through the air would, when it had arrived at its uniform velocity, only acquire a unitorm celerity ot eleven feet and a half per second ; while one-fourth of an inch would acquire a velocity of thirty-three feet and a-half.