But after ten the thing was different; by that time the hot reaper's sun had warmed the surface of the open water on which the rays fell almost from the moment the sun rose. Towards eleven o'clock the difference in temperature was marked; but those who then came to bathe, walking along the shore or rowing, dipped their hands in and found the water warm, and anticipated that it would be equally so at the bathing-place. So it was at the surface, for the warm water had begun to flow in, and the cold water out, rather deeper, setting up, in fact, an exact copy of the current of the ocean, the shadowed part by the copse representing the Polar area. Directly any one began to swim he found the difference, the legs went down into cold water, and in many cases cramp ensued with alarming results and danger. Down to the chest it was warm, quite warm, while the feet were very cold. Not much imagination is needed to conceive the effect on persons not used to rough bathing, and even a strong man might suffer. People insisted that these chills and cramps were caused by cold springs rising at the bottom, and could not be argued out of that belief. As a matter of fact there was not a single spring over the whole extent of the bottom. That part in particular was often dry, not from dry weather, but as the water of the pond was drawn away. Let it rain as much as it would, no spring ever broke up there. The cold currents were produced by the shadow of the copse, and, had the trees been felled, would have disappeared. That would have been like letting the sun of the Equator shine on the Polar seas. After a storm of wind the lee shore was marked with a dark-green line of weeds and horse-tails, torn up and drifted across, which had been thrown up by the little breakers beyond the usual level of the water. A mass of other weeds and horse-tails, boughs and leaves, remained floating; and now was seen a reversal of the habits of fishes. Every one knows that fishes seek the windward shore in a breeze for the insects blown in; but now, while the gale, though subsiding, still rippled the water, the best place to fish was on the lee shore, just at the edge of the drifted weeds. Various insects probably were there washed away from the green raft to which they had clung. The water being often lowered by drawing hatches, the level changed frequently; and as storms of wind happened at different levels, so there were several little raised beaches showing where the level had been, formed of washed gravel and stones--the counterpart, in fact, of the raised beaches of the geologists. When the water was almost all drawn off, then there was a deep winding channel in the mud of the bottom, along which trickled a little streamlet which fed the pond. The sun hardening the mud, it was possible by-and-by to walk to the edge of the channel, where it could be seen that the streamlet ran five or six feet deep between precipitous banks of mud.