The fact alone, that these blocks differ in character from all other specimens which I have seen in my travels, amongst the thousands of boulders which are strewed over the great valley of the Missouri and Mississippi, from the Yellow Stone almost to the Gulf of Mexico, raises in my mind an unanswerable question, as regards the location of their native bed, and the means by which they have reached their isolated position; like five brothers, leaning against and supporting each other, without the existence of another boulder within many miles of them. There are thousands and tens of thousands of boulders scattered over the prairies, at the base of the Côteau on either side; and so throughout the valley of the St. Peters and Mississippi, which are also subjects of very great interest and importance to science, inasmuch as they present to the world, a vast variety of characters; and each one, though strayed away from its original position, bears incontestable proof of the character of its native bed. The tract of country lying between the St. Peters river and the Côteau, over which we passed, presents innumerable specimens of this kind; and near the base of the Côteau they are strewed over the prairie in countless numbers, presenting almost an incredible variety of rich, and beautiful colours; and undoubtedly traceable, (if they can be traced), to separate and distinct beds. Amongst these beautiful groups, it was sometimes a very easy matter to sit on my horse and count within my sight, some twenty or thirty different varieties, of quartz and granite, in rounded boulders, of every hue and colour, from snow white to intense red, and yellow, and blue, and almost to a jet black; each one well characterized and evidently from a distinct quarry. With the beautiful hues and almost endless characters of these blocks, I became completely surprised and charmed; and I resolved to procure specimens of every variety, which I did with success, by dismounting from my horse, and breaking small bits from them with my hammer; until I had something like an hundred different varieties, containing all the tints and colours of a painter’s palette. These, I at length threw away, as I had on several former occasions, other minerals and fossils, which I had collected and lugged along from day to day, and sometimes from week to week.