Q. Why is there often an evening breeze during the summer months?
A. The earth radiates heat at sun-set, and the air is cooled down quickly by contact: this condensation causes a motion in the air, which is the evening breeze.
Q. Why are tropical islands always subject to a sea-breeze every morning (i. e.. a breeze blowing from the sea to the land)?
A. The solar rays are unable to heat the surface of the sea as they do the earth; therefore, the air resting on the earth is more heated than the air resting on the sea; and the colder sea air blows inland to restore the equilibrium.
Q. Why is the land breeze unhealthy?
A. Because it is frequently loaded with exhalations from putrefying animal and vegetable substances.
Q. Why is the sea breeze fresh and healthy?
A. Because it passes over the fresh sea, and is not laden with noxious exhalations.
It is healthy, therefore, to walk on the sea-beach before ten o’clock in the morning; but unhealthy after sun-set.