First cast,--to the right, straight across the stream, about twenty feet: the current carries the fly down with a semicircular sweep, until it comes in line with the bow of the canoe. Second cast,--to the left, straight across the stream, with the same motion: the semicircle is completed, and the fly hangs quivering for a few seconds at the lowest point of the arc. Three or four feet of line are drawn from the reel. Third cast to the right; fourth cast to the left. Then a little more line. And so, with widening half-circles, the water is covered, gradually and very carefully, until at length the angler has as much line out as his two-handed rod can lift and swing. Then the first "drop" is finished; the man in the stern quietly pulls up the anchor and lets the boat drift down a few yards; the same process is repeated on the second drop; and so on, until the end of the run is reached and the fly has passed over all the good water. This seems like a very regular and somewhat mechanical proceeding as one describes it, but in the performance it is rendered intensely interesting by the knowledge that at any moment it is liable to be interrupted.