 | 1919 - 384 pages
...after them the other rays. Where, therefore, the water is very deep and very pure, all the colours are absorbed, and such water ought to appear black, as...into such water ; as it sinks it becomes greener, and before it disappears, it reaches > vivid blue-green. Break such a pebble into fragments, each of these... | |
 | 1920 - 630 pages
...therefore the water is very deep and very pure, all the colours are absorbed, and such water appears black as no light is sent from its interior to the...condition is an indication of its extreme purity. " As the deep blue colour of the Mediterranean has always been a subject of remark, Mr. Bancroft gives... | |
 | Franklin Institute (Philadelphia, Pa.) - 1919 - 894 pages
...after them the other rays. Where, therefore, the water is very deep and very pure, all the colors are absorbed, and such water ought to appear black, as...greener, and before it disappears, it reaches a vivid blue-green. Break such a pebble into fragments, each of these will behave like the unbroken mass ;... | |
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Where, therefore, the water is very deep and very pure, all the colours are absorbed, and such water ought to appear black, as no light is sent from its interior to the eye. The approximation of the Atlantic Ocean to this condition is an indication of... 
