where it is bounded by a wall, and when there they butt at them, until at last their repeated blows and the softening effect of the water causes them to yield and open. And now you will see another curious sight. While shoals of Carp have been pounding away at the bread-balls, preparing them for being swallowed, some dozen monsters hover round, indifferent, apparently, to what is passing. But not so, for no sooner is the bread ready for eating, than two or three of these giants, but more generally one--the tyrant, probably, of the lake--rush to the prize, cleaving the shoals of smaller Carp, and shouldering them to the right and left, seize the bread with open jaws, between which it quickly disappears." Some of the finest and oldest Carp are found in the windings of the Spree, in the tavern-gardens of Charlottenburg, the great resort of strollers from Berlin. Visitors are in the habit of feeding them with bread, and collect them together by ringing a bell, at the sound of which shoals of the fish may be seen popping their noses upwards from the water. The affection of fishes has only been properly understood of late years. It might be supposed that little natural affection existed in this cold-blooded race; and, in fact, fishes constantly devour their own eggs, and, at a later period, their own young, without compunction or discrimination. Some few species bear their eggs about with them until hatched. This was long thought to be the utmost extent of care which fishes lavished on their young; but Dr. Hancock has stepped in to rescue at least one species from this unmerited charge. "It is asserted," he says, "by naturalists, that no fishes are known to take any care of their offspring. Both species of _Hassar_ mentioned below, however, make a regular nest, in which they lay their eggs in a flattened cluster, and cover them over most carefully. Their care does not end here; they remain by the side of the nest till the spawn is hatched, with as much solicitude as a hen guards her eggs, both the male and female Hassar, for they are monogamous, steadily watching the spawn and courageously attacking the assailant. Hence the negroes frequently take them by putting their hands into the water close to the nest, on agitating which the male Hassar springs furiously at them, and is thus captured. The _roundhead_ forms its nest of grass, the _flathead_ of leaves. Both, at certain seasons, burrow in the bank. They lay their eggs only in wet weather. I have been surprised to observe the sudden appearance of numerous nests in a morning after rain occurs, the spot being indicated by a bunch of froth which appears on the surface of the water over the nest. Below this are the eggs, placed on a bunch of fallen leaves or grass, which they cut and collect together. By what means this is effected seems rather mysterious, as the species are destitute of cutting-teeth.