A. The changes of the wind.
Q. How can the changes of the wind affect the clouds?
A. If a cold current of wind blows suddenly over any region, it condenses the invisible vapour of the air into cloud or rain: but if a warm current of wind, blows over any region, it disperses the clouds, by absorbing their vapour.
Q. What countries are the most cloudy?
A. Those where the winds are most variable, as Britain.
Q. What countries are the least cloudy?
A. Those where the winds are not variable, as Egypt.
Q. What distance are the clouds from the earth?
A. Some thin light clouds are elevated above the highest mountain-top; some heavy ones touch the steeples, trees, and even the earth: but the average height is between one and two miles.
(Streaky curling clouds, like hair, are often five or six miles high.)