Q. Why do swallows fly low when rain is at hand?
A. Because the insects (of which they are in pursuit) have fled from the cold upper regions of the air, to the warm air near the earth: and as their food is low, the swallows fly low.
Q. Why do these insects seek the lower regions of the air in wet weather, more than in fine weather?
A. Because they are forced downward, by some current of cold air which drives them down.
Q. Why does a downward current of cold air bring rain?
A. Because it condenses the warm vapour; which then descends in rain.
Q. The proverb says, “a single magpie in spring, foul weather will bring:” why is this the case?
A. In cold stormy weather, one magpie alone will leave its warm snug nest in search of food, while the other stays with the eggs or young ones; but in fine mild weather (when their brood will not be injured by cold) both the magpies will fly out together.
Q. Why is it unlucky for anglers to see a single magpie in spring?