How pleasing and soothing are some of the first and least audible sounds of awakened nature in the spring, as this first humming of bees, etc., and the stuttering of frogs! They cannot be called musical . . . Nature has taken equal care to cushion our ears on this finest sound and to inspire us with the strains of the wood thrush and poet. We may say that each gnat is made to vibrate its wings for man’s fruition. In short, we hear but little music in the world which charms us more than this sound produced by the vibration of an insect’s wing and in some still and sunny nook in spring . . .