Of the thirteen moons of the year, not one is of such significance to the outdoor naturalist as that of April. I think that there can be no doubt but that a clear sky, rather than temperature, is the important factor in the migratory movement of our birds that come from the South in spring. Certainly the morning of April 14th, of this year, was cool enough to have retarded birds sensitive to cold. Ice formed on shallow ponds and a heavy frost rested upon all the upland fields; yet at sunrise the old beeches were alive with those beautiful birds, the yellow red-polled warblers. Nor were they numb or dumb. There was not an instant that they rested, nor a moment that they did not sing. The April moon, too, has the merit of brightening the marshes, when in fullest force the frog-world comes to the fore, and perhaps never are these slimy batrachians so noisy as when the night is warm, the sky clear, and the moon full in April. Take a midnight ramble then, and see if I am not right. Of course, no one wishes to be confined to the company of croaking frogs, but other creatures will doubtless cross your path, and I assume the reader does not live in an utterly desolate region. My reference to frogs may seem to imply contempt, but it is not deserved. If they are not overwise, neither are they wholly stupid, and it is well for all men to be chary of their judgments. There are times and occasions when a frog may outwit a philosopher. Try to catch one on slippery mud, and see which sprawls the more gracefully.