Every one who is acquainted with the habits of fish is sensible of the extreme acuteness of their vision, and well knows how easily they are scared by shadows in motion, or even at rest, projected from the bank; and often has the angler to regret the suspension of a successful fly-fishing by the accidental passage of a person along the opposite bank of the stream: yet, by noting the apparently trivial habits of one of nature's anglers, not only is our difficulty obviated, but our success insured. The heron, guided by a wonderful instinct, preys chiefly in the absence of the sun; fishing in the dusk of the morning and evening, on cloudy days and moonlight nights. But should the river become flooded to discoloration, then does the "long-necked felon" fish indiscriminately in sun and shade; and in a recorded instance of his fishing on a bright day, it is related of him, that, like a skilful angler, he occupied the shore opposite the sun. * * * * * SKILFUL ANATOMISTS. (_For the Mirror_.) It may not be generally known that the tadpole acts the same part with fish that ants do with birds; and that through the agency of this little reptile, perfect skeletons, even of the smallest fishes may be obtained. To produce this, it is but necessary to suspend the fish by threads attached to the head and tail in an horizontal position, in a jar of water, such as is found in a pond, and change it often, till the tadpoles have finished their work. Two or three tadpoles will perfectly dissect a fish in twenty-four hours. H.S.S. * * * * * THREE ENTHUSIASTIC NATURALISTS.