On a breezy day, when the sun scorches the sand and the wind continuously sweeps off the dry surface, and your ears detect the musical sound accompanying the process--vague as the visible part of it is blurred and misty--then it is that you are made aware of the agencies by which time creates geographical differences. Precipitated at the apex of the spit, the sand as it sinks tints the verge of the sea, while the lighter spoil, leaves and wisps of seaweed, trip off on independent voyage. The current from the south pares the spit, preserving its shapeliness. The ebb from the bay maintains the fluent inner curve. The dry wind, the current with its northerly set, and the ebb in conjunction, push the spit to the north, and as the sand advances, vegetation consolidates the work. Then comes the season of northerly winds, when the apex of the spit is forced backwards and outwards into a brief but graceful flourish, in the bight of which small boats may nestle, though the seas roar and show white teeth a few yards away. Since the winds of the north are less in duration and persistency than those from the south and east, the tendency of the spit--in defiance of the yearly setback--is to the north. Driftwood, logs, and huge trees with bare, branchless limbs become stranded, to dry and whiten in the sun and reinforce the sand, and in their decay, with ever contributed seaweed, to make mould for vegetation. The work of encroachment and consolidation is incessant and strangely rapid, for vegetation never lacks pioneers of special character to prepare the way for the less venturesome and less hardy. Often before vegetation appears, coral chips, shells, small stones, and sharp gravel, are concreted into platter-shaped masses which seem to become the base of blocks of rough conglomerate, capable of resisting the attacks of the sea; and a few yards back, where a mangrove-bordered creek once existed, the mud and decayed fragments of wood have been transformed into a black, cheesy substance which might be mistaken for soft coal. So do these beaches lay bare their secrets.