Lost trappers and Indians have been saved by finding water in them, when otherwise they would have perished from thirst." "How very round they are!" said Francois; "why, they are perfect circles! How do the buffaloes make them so ?" "By laying themselves out at full length and spinning round and round like a wagon wheel upon its nave.

They revolve with great rapidity, using their humped shoulders as a pivot, and their legs as levers.

They sometimes continue this motion for half-an-hour at a time.

No doubt they do this, as has been said, to scratch themselves; for, notwithstanding their thick hides and hair, they are much annoyed by insect-parasites.

They do it, too, for amusement, or to give themselves pleasure, which is the same thing.