Capt. Lewis, March 7, 1806--There are two speceis of loons. Ist. the Speckled loon found on every part of the rivers of this country, they are the same size and colours and form with those of the Atlantic coast. the second speceis we first met with at the great falls of the Columbia and from thence down. this bird is not more than half the size of the speckled loon, it's neck is long, slender and white in front. the Colour of the body and back of the neck and head are of a dun or ash colour, the breast and belley are white. the beak is like that of the speckled loon and like them it cannot fly but flutters along on top of the warter or dives for security when pursued.