Living on the banks of the Thames, I have often been pleased with seeing the care taken of the young swans by the parent birds. Where the stream is strong, the old one will sink herself sufficiently low to bring her back on a level with the water, when the cygnets will get upon it, and in this manner are conveyed to the other side of the river, or into stiller water. Each family of swans on the river has its own district; and if the limits of that district are encroached upon by other swans, a pursuit immediately takes place, and the intruders are driven away. Except in this instance, they appear to live in a state of the most perfect harmony. The male is very attentive to the female, assists in making the nest, and when a sudden rise of the river takes place, joins her with great assiduity in raising the nest sufficiently high to prevent the eggs being chilled by the action of the water, though sometimes its rise is so rapid, that the whole nest is washed away and destroyed.—_Jesse._ CYGNETICS, _s. obs._ The art of hunting. CYST, _s._ A bag containing some morbid matter. ------------------------------------------------------------------------ DAB, _s._ A kind of small flat fish. DAB-CHICK, _s._ A water-fowl. DACE, _s._ A small river-fish, resembling a roach. [Illustration: DACE.] Dace or Dare, is gregarious, is a great breeder, very lively, and during summer is fond of frolicking near the surface. Its head is small, the irides of a pale yellow; the body long and slender; its scales are smaller than those of the roach, and is upon the whole a handsomer fish; the back is varied with dusky, and a cast of yellowish green; the sides and belly silvery, the ventral, anal, and caudal fins are sometimes of a pale red hue; the tail is very much forked. The dace is seldom above ten inches long, although in a list of fish sold in the London markets, with the greatest weight of each, communicated to Mr. Pennant, there is an account of one that weighed a pound and half, and according to Linnæus, it grows to a foot and half in length. The haunts of Dace are deep water, near piles of bridges, where the stream is gentle, over gravelly, sandy, and clayey bottoms; deep holes that are shaded, water-lily leaves, and under the foam caused by an eddy; in the warm months they are to be found in shoals on the shallows near to streams; the dace spawn in March, are in season about three weeks after; they improve, and are very good, about Michaelmas, but are best in February, and are said in that month, when just taken, scotched, and broiled, to be more palatable than a fresh herring.