THERE is always a new page to be turned in natural history, if one is sufficiently on the alert. I did not know that the eagle celebrated his nuptials in the air till one early spring day I saw a pair of them fall from the sky with talons hooked together. They dropped a hundred feet or more, in a wild embrace, their great wings fanning the air, then separated and mounted aloft, tracing their great circles against the clouds. "Watch and wait" is the naturalist's sign. For years I have been trying to ascertain for a certainty the author of that fine plaintive piping to be heard more or less frequently, according to the weather, in our summer and autumn woods. It is a note that much resembles that of our small marsh frog in spring,--the hyla; it is not quite so clear and assured, but otherwise much the same. Of a very warm October day I have heard the wood vocal with it; it seemed to proceed from every stump and tree about one. Ordinarily it is heard only at intervals throughout the woods. Approach never so cautiously the spot from which the sound proceeds, and it instantly ceases, and you may watch for an hour without again hearing it. Is it a frog, I said, the small tree-frog, the piper of the marshes, repeating his spring note, but little changed, amid the trees? Doubtless it is, yet I must see him in the very act. So I watched and waited, but to no purpose, till one day, while bee-hunting in the woods, I heard the sound proceed from beneath the leaves at my feet. Keeping entirely quiet, the little musician presently emerged, and, lifting himself up on a small stick, his throat palpitated and the plaintive note again came forth. "The queerest frog ever I saw," said a youth who accompanied me, and whom I had enlisted to help solve the mystery. No; it was no frog or toad at all, but the small red salamander, commonly called lizard. The color is not strictly red, but a dull orange, variegated with minute specks or spots. This was the mysterious piper, then, heard from May till November through all our woods, sometimes on trees, but usually on or near the ground. It makes more music in the woods in autumn than any bird. It is a pretty, inoffensive creature, walks as awkwardly as a baby, and may often be found beneath stones and old logs in the woods, where, buried in the mould, it passes the winter. (I suspect there is a species of little frog--Pickering's hyla [footnote: A frequent piper in the woods throughout the summer and early fall.]--that also pipes occasionally in the woods.) I have discovered, also, that we have a musical spider. One sunny April day, while seated on the borders of the woods, my attention was attracted by a soft, uncertain, purring sound that proceeded from the dry leaves at my feet. On investigating the matter, I found that it was made by a busy little spider. Several of them were traveling about over the leaves, as if in quest of