The Michigan grayling was first described by Professor E.D. Cope, in 1865, from specimens from the Au Sable River. He named it _tricolor_, on account of its handsomely-decorated fins and body. At that time it was abundant in the Au Sable, Manistee, Marquette, Jordan, Pigeon, and other rivers in the northern part of the lower peninsula of Michigan, and in Otter Creek, near Keweenah, in the upper peninsula. It has a somewhat larger head than the Arctic form, its length being about one-fifth of the length of the body; the outline of the latter does not differ except in not being so prominent over the shoulder. The coloration is purplish gray with silvery reflections, darker on the back, belly white and iridescent; sides of head with bright bluish and bronze lustre; sides of the body with small, black, irregular spots; ventral fins with oblique, rose-colored lines; dorsal with alternate dusky and rose-colored lines below, and alternate rows of dusky green and roseate spots above; caudal fin dusky with a middle roseate stripe. In 1870-1876 I visited most of the grayling streams in Michigan, and found it abundant, affording fine fishing. At that time it was also in the Boyne, and in Pine Lake and River. I also took it in Lake Michigan while fishing for cisco from the pier at Charlevoix. Fish running from a pound to a pound and a half were common, and occasionally one of two pounds was taken. It is sad to contemplate the gradual disappearance of this fish from the once densely populated streams of Michigan. At the present day the angler is fortunate, indeed, who succeeds in taking a brace of grayling where a few years ago his basket was soon filled. This deplorable state of affairs has been brought about by the axe of the lumberman, whose logs, descending the small streams on the spring rise, plough up the spawning beds, smothering the eggs and killing the helpless fry. As brook-trout spawn in the fall they escape this calamity, the fry being old enough in April to take pretty good care of themselves. The decrease of both trout and grayling is commonly attributed to overfishing; but while this may have its influence to a limited extent in lessening the numbers for a season, other causes must be looked for to account for the permanent depletion of certain waters. A stream or pond will support but a limited number of fish, the number depending on the supply of natural food for both young and mature. By the supply of food on one hand, and the natural enemies of the fish on the other, a certain balance is maintained which if disturbed by, say, overfishing one season, will be restored by natural laws the next. And this state of affairs will continue so long as the natural conditions of the waters remain undisturbed.