Their music on the flute referred to herein merits some notice. The instrument is made of wood, about the length and size of an octave flute, and the mouth on the principle of a whistle. There are four finger holes above and one underneath for the thumb. No tune or anything approaching it can be produced from this instrument, yet they can sound different calls in a shrill tone. It is played in several of their dances as an accompaniment to singing, not, however, producing any sound accordant with the voice. The principal purpose for which it is made and used is love making. By the various notes the following intelligence can be conveyed by the man outside to the woman inside the lodge, without any of the inmates except her knowing for whom they are intended, as the whistle can be distinctly heard at the distance of 100 yards or more: “I am here waiting for you,” “I am watched,” “Remain,” “I will come again,” “Meet me to-morrow,” and several other communications of a like nature. The meanings of these different sounds are agreed upon and understood by the parties beforehand. As the instrument admits of considerable variation in its tone and note all their calls are different, and no other person would understand them rightly. They might suspect some assignation to be going forward, but would not know with or between whom. Songs and this whistle are used in their serenades and dances. LONGEVITY The changes, exposures, and deprivations attending on the life of the roving tribes are without doubt great causes of the slow increase of Indian population. We think from actual observation that not more than two out of five children live until youth is passed. Even a few days after their birth, and sometimes but a few hours after, they are packed on the backs of their mothers in all weather, exposed to cold, snow, and wet. They must be iron to stand this. Should they be so fortunate as to reach the age of 4 to 6 years they follow the camp on foot through spring thaws, exposed to rain and cold, for weeks together, and a great many thus die from cold, pleurisy, and rheumatism. No question but the uncertainty of their food also contributes to their mortality, not that they often absolutely starve to death, but are rendered weak and unable to stand the hardship the life requires. In maturity war takes off another portion of the remainder, and diseases contracted by the exposures of their youth, together with their continued exertions as required by their precarious life, places it beyond probability of many arriving at extreme age. It is evident that the hard labor the women perform after marriage ruins their constitutions. A woman is old on the plains at the age of 35 years, and seldom healthy. They have from 2 to 5 children, more are occasionally seen, but 7 or 8 is a rare occurrence. There are but few very old women. The usual diseases by which they are carried off are pains in the head, heart, and side,