Sometimes two of them intersect each other, forming a triangular space or peninsula between; and the traveller on reaching this point is obliged to turn back, as he finds himself almost encircled by precipices yawning downward into the earth.

Whenever the Indians get a herd of buffaloes near one of these canons, they surround them on three sides, and guide them towards the precipice; and when they are near enough, gallop forward with wild shouts, causing the buffaloes to dash madly and blindly over.

A whole herd will sometimes leap a precipice in this way--those in the front being forced over by the others, and, these in turn pressed, either to take the leap or be thrust by the spears of the pursuing horsemen.
Sometimes when the Indians are not insufficient numbers to make a "surround" of buffalo, they collect buffalo chips, and build them in little piles so as to represent men.

These piles are placed in two rows, gradually converging towards each other, and leading to one of the aforementioned bluffs.

Between these two rows they drive the buffaloes, that, mistaking the piles of their own "chips" for Indians, are guided onwards to the edge of the precipice, when the hunters make their noisy rush, and force them over.
There are other methods of buffalo-hunting, such as pursuing them in the snow, when the hunters in their snow-shoes easily overtake and slaughter them.