When the eggs of salmon and trout have been submitted to the action of clear running water for a few months they begin to hatch. Prior to this the young fish may be seen inside packed away in a most beautiful manner. The embryo increases in bulk until on some warm April day the tiny fish bursts its shell and finds itself in a wide world of waters. Individual eggs may be seen to hatch, and the process is most interesting. First the shell splits at the part corresponding to the back. Then a tiny head with golden eyes appears, and after two or three convulsive waves of his little tail the now useless shells fall from off him. He seems to enjoy the watery element in which he finds himself, for away he swims as fast as his tiny fins and wriggling tail will carry him, round and round in a circle, until presently he sinks down again to the sheltering gravel, for the first time breathing freely by his delicate gills. Every young salmon and trout has a tiny umbilical sac attached, and upon the contents of which it must feed until it has learnt to look out for itself, a period of from six to eight weeks. Frank Buckland has stated that no other animal increases so rapidly at so little cost, and becomes such a valuable article of food as the salmon. At three days old it is nearly two grains in weight; at sixteen months it has increased to two ounces, or four hundred and eighty times its first weight; at twenty months old, after the smolt has been a few months in the sea, it becomes a grilse of eight and a half pounds, having increased sixty-eight times in three or four months; at two and three-quarter years old it becomes a salmon of twelve pounds to fifteen pounds; after which its increased rate of growth has not been satisfactorily ascertained, but by the time it becomes thirty pounds it has increased one hundred and fifteen thousand two hundred times the weight it was at first. The only parts of a young salmon or trout which is fully developed immediately it leaves the egg are its eyes. These are golden with a silver sheen, and beautifully bright--the great aids in steering clear of an almost innumerable set of enemies which this new stage of existence brings. And it is really difficult to say whether these game fishes have more enemies when in the egg or after they are hatched. Of some of the former we have already spoken, and now let us look to the latter.