If there be a breeze a fleet of white sails comes round the willow-hidden bend. But the Thames yachtsmen have no slight difficulties to contend with. The capricious wind is nowhere so thoroughly capricious as on the upper river. Along one mile there may be a spanking breeze, the very next is calm, or with a fitful puff coming over a high hedge, which flutters his pennant, but does not so much as shake the sail. Even in the same mile the wind may take the water on one side, and scarcely move a leaf on the other. But the current is always there, and the vessel is certain to drift. When at last a good opportunity is obtained, just as the boat heels over, and the rushing bubbles at the prow resound, she must be put about, and the napping foresail almost brushes the osiers. If she does not come round--if the movement has been put off a moment too long--the keel grates, and she is aground immediately. It is nothing but tacking, tacking, tacking--a kind of stitching the stream. Nor can one always choose the best day for the purpose; the exigencies of business, perhaps, will not permit, and when free, the wind, which has been scattering tiles and chimney-pots and snapping telegraph wires in the City all the week, drops on the Saturday to nothing. He must possess invincible patience, and at the same time be always ready to advance his vessel even a foot, and his judgment must never fail him at the critical time. But the few brief hours when the circumstances are favourable compensate for delays and monotonous calms; the vessel, built on well-judged lines, answers her helm and responds to his will with instant obedience, and that sense of command is perhaps the great charm of sailing. There are others who find a pleasure in the yacht. When at her moorings on a sunny morning she is sometimes boarded by laughing girls, who have put off from the lawn, and who proceed in the most sailor-like fashion to overhaul the rigging and see that everything is shipshape. No position shows off a well-poised figure to such advantage as when, in a close-fitting costume, a lady's arms are held high above her head to haul at a rope. So the river life flows by; skiffs, and four oars, canoes, solitary scullers in outriggers, once now and then a swift eight, launches, a bargee in a tublike dingey standing up and pushing his sculls instead of pulling; gentlemen, with their shoulders in a halter, hauling like horses and towing fair freights against the current; and punts poled across to shady nooks. The splashing of oars, the staccato sound as a blade feathered too low meets the wavelets, merry voices, sometimes a song, and always a low undertone, which, as the wind accelerates it, rises to a roar. It is the last leap of the river to the sea; the last weir to whose piles the tide rises. On the bank of the weir where the tide must moisten their roots grow dense masses of willow-herb, almost as high as the shoulder, with trumpet-shaped pink flowers.