THE ROUND-FISH (_Coregonus quadrilateralis_).—_Sp. Ch._: Colour, yellowish-brown, paler on the sides and belly than on the back; scales bright and glittering, each edged with a narrow border of dark-grey; cheeks, fins, and tail, a deeper tint of the same colour as that on the back; head one-sixth of the length (without the caudal); mouth very small, under-jaw shorter than the upper—no teeth perceptible. This fish has a very wide geographical range, being found as far north (according to Sir J. Richardson) as the Mackenzie and Coppermine rivers, east of the Rocky Mountains, and latitude 49° N. the western side; how much farther they range north of 49° I had no opportunity of judging. This handsome and delicious fish, one of the _Salmonidæ_, is most valuable as an article of food to the Indians, west of the Rocky Mountains, the White-fish (_Coregonus albus_), or ‘Attihawmeg’ (which means ‘reindeer of the sea’), being of like importance to those residing east of the mountains. There the Indians frequently have to subsist entirely on white-fish, and, at many of the fur-trading stations, the traders get very little else to eat during nine months of the twelve. ‘In one small lake (Lake St. Ann’s), near Fort Edmonton, forty thousand white-fish were taken, of an average weight of three to four pounds, in the course of three weeks.’ (_Palliser’s Exp._) Two modes are adopted for preserving them—one that of sun-drying, the other by freezing, in which state they may be kept perfectly sweet and free from taint for the whole winter. The Round-fish is seldom taken over two pounds in weight, and prior to spawning they are loaded with fat, which on the shoulders almost amounts to a hump, but becomes thin, watery, and insipid, after the all-important duty of providing for their offspring is accomplished. I am not quite sure when they return to the sea, as nothing is seen of them after the ice sets in, towards the end of November, until their arrival on the following year. The ova are deposited in much the same way as that of other _Salmonidæ_: a hollow made in the gravel contains the eggs and milt, which are covered over and abandoned—the young fish, on its emergence from the egg, taking care of itself as best it can.