Some of the earlier records of knot's nests are open to doubt, but there can be no doubt about the two nests found by Peary in 1909. Referring to his own failure and Peary's success, Colonel Feilden (1920) says: The nests and eggs of the knot were obtained by Peary in the vicinity of Floeberg Beach where the "Nares" expedition of 1875-76 wintered on the exposed coast of Grinnell Land north of 82° N. lat., and where Peary, on the _Roosevelt_, wintered in 1908 and 1909 at Cape Sheridan some 3 or 4 miles farther north, and which was the base for his ever-memorable adventure to the North Pole. Probably the reason why we failed in 1876 to obtain the eggs was due to our ignorance of the localities selected by the birds for nesting. We saw the birds circling over and feeding around the small pools of water left by the melted snow, which here and there were surrounded by sparse tufts of vegetation, and we gave too much of our scanty time to the searching of the marshy spots. Peary's photographs show that in Grinnell Land the knot has its nests on the more elevated slopes and surfaces covered by frost-riven rocks and shales. The finding of a knot's nest in Grinnell Land is not an easy task, and it is highly commendable that Peary on his return from the North Pole to Cape Sheridan, and in the midst of his engrossing and more important duties found occasions to take the unique photographs here reproduced. Two nests with eggs were found by the Crockerland expedition in northwestern Greenland, of which Doctor Ekblaw has sent me the following account: Though level lands along the shores and the river valleys, or about the pools constitute the feeding grounds of the knots, the high plateaus far back among the hills, covered with glacial gravel or frost-riven rubble, furnish their nesting sites. By this rather anomalous choice of nesting site, the knot was long able to keep its nest and eggs a secret, and it was not until the members of the Crockerland Arctic Expedition persistently ran down every clue that two full clutches of eggs in the nests were discovered in June, 1916, on a high flat-topped ridge back of North Star Bay, at least 3 miles from shore.