IIIFカラー高解像度
国立情報学研究所 - ディジタル・シルクロード・プロジェクト
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| IIIFカラー高解像度 |
| India and Tibet : vol.1 | |
| インドとチベット : vol.1 |
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引用情報
A LOVELY LAKE 233
feet above sea-level. In shape it was like a rough ring, sur-
rounding what is practically an island ; and in colour it
varied to every shade of violet and turquoise blue and
green. At times it would be the blue of heaven, reflect-
ing the intense Tibetan sky. Then, as some cloud passed
over it, or as, marching along, we beheld it at some
different angle, it would flash back rays of the deep greeny-
blue of a turquoise. Anon it would show out in various
shades of richest violet. Often, when overhead all was
black with heavy rain-clouds, we would see a streak of
brilliant light and colour flashing from the far horizon of
the lake ; while beyond it and beyond the bordering moun-
tains, each receding range of which was of one more
beautiful shade of purple than the last, rose once more
the mighty axial range of the Himalayas, at that great
distance not harsh in their whity coldness, but softly
tinted with a delicate blue, and shading away into the
exquisite azure of the sky. What caused the marvellous
colouring of this lake, which even the Tibetans call the
Turquoise Lake, we could none of us say. Perhaps it was
its depth, perhaps it was its saline character, or some
chemical component of its water. But whatever the
main cause, one cause at least must have been the in-
tense blue of the Tibetan sky at these great altitudes, so
deep and so translucent that even the sky of Greece and
Italy would pale beside it.
This latter theory is what Lord Rayleigh would adopt.
In a lecture which he delivered this year at the Royal
Institution on the causes of the coloration of water, he
gave his conclusion, from careful observations and tests,
that the cause of the blueness of, say, the Mediterranean
Sea was the Mediterranean sky, which was exactly the
theory we had thought must apply to this Tibetan lake.
Marching along by this lake we had much rain, turning
into snow at night. Pete Jong, a picturesque little fort
close to the shore, was reached on the 22nd, where, as at
Nagartse, a company of infantry and a few mounted
infantry were left to keep up the line of communications.
From here the mounted infantry, reconnoitring ahead,
reported the remnants of the Kham force to be retreating
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