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Now I think we have so many that we can turn back." His comrade did not lift the oars, but sat and looked around. "It is lovely out here on the lake to-night," said he. And so it was. It was absolutely still, so that the entire water-surface lay in undisturbed rest with the exception of the streak where the boat had gone forward. This lay like a path of gold, and shimmered in the firelight.
The water-surface alone was hidden from my sight the very thing I was most anxious to observe. As if by some envious demon of the flood, this curtain seemed to have been drawn: for, just as the fog had fairly unfurled itself, I fancied I could hear the dipping of a paddle at no great distance off in the channel of the stream.
The most beautiful part of the road, however, to my taste, is the descent, when the shining expanse of Camp's Bay lies shimmering in the warm afternoon haze with a thousand lights and shadows from cloud and cliff touching and passing over the crisp water-surface.
The geniality of the Oligocene period was due, like that of the earlier warm periods, to the low-lying land and very extensive water-surface. These conditions were revolutionised before the end of the Tertiary. Great mountains towered into the snow-line, and vast areas were elevated which had formerly been sea or swamp.
This action of wave upon wave is technically called interference, a term, to be remembered. To the eye of a person conversant with these principles, nothing can be more interesting than the crossing of water ripples. Through their interference the water-surface is sometimes shivered into the most beautiful mosaic, trembling rhythmically as if with a kind of visible music.
Above him spread the yellow sunset light, around him the birch-boughs hung and the ivy-tendrils swayed, while behind him there appeared a glimmering water-surface, across which slowly drifted the tall masts of a schooner. It looked strangely like a view I had seen of some foreign harbor, Amalfi, perhaps, with a vine-clad balcony and a single human figure in the foreground.
Fronting these docks on the Liverpool side of the Mersey is the great sea-wall, over five miles long, behind which are enclosed 400 acres of water-surface in the various docks, that are bordered by sixteen miles' length of quays. On the Birkenhead side of the river there are ten miles of quays in the docks that extend for over two miles along the bank.
An ounce to each fifteen square feet of water-surface is all that is required, though the oiling needs to be repeated carefully several times during the season. But what of the eggs? They require no air, and it was found impossible to poison them without simply saturating the water with powerful poisons; but an unexpected ally was at our hand.
These reservoirs are generally formed by damming the outlets of natural valleys; and the dams average half a mile in length, though some of them are thirty miles long and form ponds covering from 37,000 to 50,000 acres. The areas of these reservoirs alone considerably increase the water-surface, and each one of them irrigates an extent of cultivated ground much larger than itself.
The warmth of the Jurassic period is generally attributed to the low relief of the land, and the very large proportion of water-surface. The effect of this would be to increase the moisture in the atmosphere. Whether this was assisted by any abnormal proportion of carbon-dioxide, as in the Carboniferous, we cannot confidently say.
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