...cloud-particle was formerly represented by a dust-particle, which vapour by condensing upon it has made visible. When there is much dust in the air but little vapour...heavier, and easily float in the air. If there are few dust specks each gets more vapour, is heavier, and falls more quickly. These experiments were repeated...

...was formerly represente.! by a dust-particle, whi^h vapour by condensing upon it has made visible. When there is much dust in the air but little vapour...heavier, and easily float in the air. If there are few dust specks each gets more vapour, is heavier, and falls more quickly. These experiments were repeated...

...cloud-particle was formerly represented by a dust-particle, which vapour by condensing upon it has made visible. When there is much dust in the air but little vapour...heavier, and easily float in the air. If there are few dust specks each gets more vapour, is heavier, and falls more quickly. These experiments were repeated...

...is much dust in the air but little vapor condenses on each particle, 308 ON 1)UST, FOGS, AND CLOUDS. and they become but little heavier, and easily float in the air. If there are few dust specks each gets more vapor, is heavier, and falls more quickly. These experiments were repeated...

...cloud-particle was formerly represented by a dust-particle, which vapour by condensing upon it has made visible. When there is much dust in the air but little vapour...heavier, and easily float in the air. If there are few duat specks each gets more vapour, is heavier, and falls more quickly. These experiments were repeated...

...observations. The mean daily distance seen is only twenty-live miles. The mean number of days in the year i which a distance of fifty miles can be seen is ninety....quickly. When the air is nearly pure, and only a few dust -particles present, then only a few cloud-particles form, and they are heavy, and fall like tine...

...conclusions : — ' Vapour must have some solid or liquid body on which to condense, and the dust-particles form the nuclei required. When there is much dust...gets more vapour, is heavier, and falls more quickly. If there were no dust in the air, there would be no mists or clouds, and the supersaturated air would...

...particles coated with an extremely thin film of water. Other experiments lead him to conclude that when there is much dust in the air, but little vapour condenses on each particle, and thus all may continue floating ; but if the proportion of dust to condensible vapour is small, each...

...cloud-particle was formerly represented by a dust-particle, which vapour by condensing upon it has made visible. When there is much dust in the air but little vapour...heavier, and easily float in the air. If there are few dust specks each gets more vapour, is heavier, and falls more quickly. These experiments were repeated...

...cloud-particle was formerly represented by a dust-particle, which vapour by condensing upon it has made visible. When there is much dust in the air but little vapour...become but little heavier, and easily float in the air. I f there are few dust specks each gets more vapour, is heavier, and falls more quickly. These experiments...