He gives also a most interesting observation on the use of a weighted pump drill among the Chukchis. The Chukchis also use flint and steel.[39] The drilling set from Point Barrow (pl. LXXVI, fig. 32), will show the appearance of the parts of the fire-drill if we substitute the round stick for the flint drill. Some of the old drill stocks are pointed with finely chipped flint heads. The length of these points varies from 2 to 4 inches; the transverse section of one would be a parabola. They are in general more finely wrought than any of the prehistoric drills found in various localities all over the world. Prehistoric man was an adept in the art of drilling stone, bone, and shell; the stone tubes, some of them 18 inches long, bored very truly, are triumphs of the American Indians. Without doubt the prehistoric drill points were mounted like the Eskimo specimen, and were, perhaps, twirled between the hands, the almost universal method of using the fire-drill. Japanese carpenters drill holes in this way. The winged mouth-piece is also a good example of workmanship. It is set with a mottled, homogeneous stone that is tolerably soft, which gives a minimum friction. This stone is much affected by the tribes over quite an extent of coast for labrets, etc. It is probably an article of trade as are flints. The bow is of walrus tusk, accurately made, but poorly engraved in comparison with the life-like art work of the southern Eskimo. Another drilling set is from Sledge Island (pl. LXXVII, fig. 33). The Museum has no fire-making specimen from this locality. The drill stock is set with a point of jadeite lashed in with sinew cord. The bow is of walrus ivory; it is rounded on the belly and flat on the back. All Eskimo bows of ivory have a like curve, no doubt determined by the shape of the walrus tusk. In another, the most common form of the bow, its section is nearly an isosceles triangle, one angle coming in the center of the belly of the bow. The head is intended to be held in one or both hands; it agrees in form with the rude St. Lawrence Island heads. Mr. E. W. Nelson collected at Unalakleet, in Norton Sound, a fire-drill, and the native names of the parts. The name of the set is _ŏŏ-jŏŏ-gŭ-tat_; the mouth-piece, _nă-ghŏŏ-tuk_; the drill, _ŏŏ-jŏŏ-ga-tuk_; the hearth of tinder-wood, _athl-uk_; the bow, _arshu-lŏw-shuk-pish-ik-sin-uk_. Plate LXXVI. [Illustration: Fig. 32. Boring-set. Cat. Nos. 89400, 89424, and 89630, U. S. N. M. Point Barrow, Alaska. Collected by Lieut. P. H. Ray, U. S. A.] Plate LXXVII. [Illustration: Fig. 33. Drilling-set. Cat. Nos. 25021, 44978, and 45108, U. S. N. M. Sledge Island, Alaska. Collected by E. W. Nelson.]