Either a light trout bait-rod or the fly-rod may be employed for bait-fishing for grayling, with fine silk line, leader, and hooks Nos. 6 to 8 with a split-shot sinker a foot above the hook. English anglers use a small float, but in fishing down-stream it is not advisable, as the current prevents the bait from touching the bottom, and renders the use of a float for this purpose unnecessary. The bait should be kept from six inches to a foot above the bottom. The best bait is the larva of the caddis-fly, a small worm or caterpillar encased in a bag or covering composed of bits of bark, sticks, etc.; it is known in the Rocky Mountain region as the "rockworm." Earthworms, small grasshoppers, crickets, and grubs of various kinds are also useful. When it became known to fishculturists, about 1874, that the grayling existed in Michigan, attempts were made to propagate it artificially, but without success, as the same lines were pursued as with the brook-trout. It remained for the United States Fish Commission to successfully cope with the problem in Montana, under my supervision. Beginning with 1898, we have hatched millions at Bozeman Station and the auxiliary station near Red Rock Lake, at the head of the Jefferson River. We have also shipped millions of eggs to different parts of the Union, as far east as Maine, New Hampshire, and Vermont, mostly to United States Fish Commission stations, where they were hatched and planted in suitable streams. It is to be hoped that some of these plants will result in the permanent establishment of this beautiful and desirable fish in eastern waters. The eggs of the grayling are smaller than those of the trout, being but one-seventh of an inch in diameter. When first extruded they are amber-colored, owing to a large oil-drop, which renders them lighter than trout eggs, almost semi-buoyant, and for this reason are best hatched, or at least "eyed," in hatching jars. My plan is to keep them in the hatching jars until the eye-spots show, when they are removed to hatching-trays until incubation is complete. In a few days after extrusion the eggs become crystal-like or hyaline in color, when the embryo can be seen in motion. The period of incubation is from ten days to two weeks. The fry when hatched are very small, about the size of mosquito "wigglers" (larvæ). Their umbilical yolk-sac is absorbed in a few days, when it becomes imperative to supply them with stream water, which contains the small organisms (_Entomostraca_) on which they feed at first. Afterward they can be fed artificially the same as trout fry, which they soon outgrow.