V
This is the season of small sounds. As a test of the keenness of your ears go out at night into some open glade in the woods or by the side of some pond and listen for the squeaking of the bats flitting and wavering above in the uncertain light over your head. You will need a stirless midsummer dusk; and if you can hear the thin, fine squeak as the creature dives near your head, you may be sure your ears are almost as keen as those of the fox. The sound is not audible to most human ears.