Ah, how little we can see of what goes on about us, though we are closely watching, and every sense is alert! On one side is a flash of wings, and somebody disappears before he is seen; from the other comes an unfamiliar note, and a rustle of leaves, behind which the author is hidden. Here two bird voices are heard in excited talk, but your hasty glance falls only on the swaying twig that proclaims their flight; and in the tops of tall trees is a whole world of life and action entirely beyond your vision. [Sidenote: _HOW TO BE HAPPY._] Early in the study of bird-life one must learn to be content with comparatively little, and not set his heart on solving every mystery of sound or glimpse which comes to him. One must be content to let some things remain unknown, and enjoy what he can understand, if he would be happy with nature. And if at some future time--as often happens--the mystery is solved, the joy is great enough to pay for waiting, and much greater than if he had worried and tramped the country over in attempts to settle it. I have seen it recommended as the best way to know birds, to follow every note heard, till the bird is found and identified. This method requires great activity, and often an hour's search results in the discovery of an unfamiliar note of a familiar bird,--the robin or sparrow, perhaps. Meanwhile one has missed a dozen charming scenes in bird-life, and a chance to make acquaintances worth more than the gratification of that curiosity. The wiser course, it seems to me, is to learn to be content with what comes to you, and not mourn over what eludes you; to be happy with what nature offers you, nor make yourself miserable over what she for the present withholds; to adopt for your motto the grand words of a fellow bird-lover,-- "What is mine shall know my face." And in spite of such regrets, enough is always left to repay patient waiting. From across the brook comes the unceasing cry of the Maryland yellow-throat, "Witches here! witches here!" and you can readily believe him, especially as with your best efforts you can see scarcely more than a suggestion of his quaint black mask, as a small form dives into the thick bushes.