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But there they change. As they turn to the sheer descent, the white and blue and slate-colour, in the heart of the Canadian Falls at least, blend and deepen to a rich, wonderful, luminous green. On the edge of disaster the river seems to gather herself, to pause, to lift a head noble in ruin, and then, with a slow grandeur, to plunge into the eternal thunder and white chaos below. Where the stream runs shallower it is a kind of violet colour, but both violet and green fray and frill to white as they fall. The mass of water, striking some ever-hidden base of rock, leaps up the whole two hundred feet again in pinnacles and domes of spray. The spray falls back into the lower river once more; all but a little that fines to foam and white mist, which drifts in layers along the air, graining it, and wanders out on the wind over the trees and gardens and houses, and so vanishes.

The manager of one of the great power-stations on the banks of the river above the Falls told me that the centre of the riverbed at the Canadian Falls is deep and of a saucer shape. So it may be possible to fill this up to a uniform depth, and divert a lot of water for the power-houses. And this, he said, would supply the need for more power, which will certainly soon arise, without taking away from the beauty of Niagara. This is a handsome concession of the utilitarians to ordinary sight- seers. Yet, I doubt if we shall be satisfied. The real secret of the beauty and terror of the Falls is not their height or width, but the feeling of colossal power and of unintelligible disaster caused by the plunge of that vast body of water. If that were taken away, there would be little visible change; but the heart would be gone.

The American Falls do not inspire this feeling in the same way as the Canadian. It is because they are less in volume, and because the water does not fall so much into one place. By comparison their beauty is almost delicate and fragile. They are extraordinarily level, one long curtain of lacework and woven foam. Seen from opposite, when the sun is on them, they are blindingly white, and the clouds of spray show dark against them. With both Falls the colour of the water is the ever- altering wonder. Greens and blues, purples and whites, melt into one another, fade, and come again, and change with the changing sun. Sometimes they are as richly diaphanous as a precious stone, and glow from within with a deep, inexplicable light. Sometimes the white intricacies of dropping foam become opaque and creamy. And always there are the rainbows. If you come suddenly upon the Falls from above, a great double rainbow, very vivid, spanning the extent of spray from top to bottom, is the first thing you see. If you wander along the cliff opposite, a bow springs into being in the American Falls, accompanies you courteously on your walk, dwindles and dies as the mist ends, and awakens again as you reach the Canadian tumult. And the bold traveller who attempts the trip under the American Falls sees, when he dare open his eyes to anything, tiny baby rainbows, some four or five yards in span, leaping from rock to rock among the foam, and gambolling beside him, barely out of hand’s reach, as he goes. One I saw in that place was a complete circle, such as I have never seen before, and so near that I could put my foot on it. It is a terrifying journey, beneath and behind the Falls. The senses are battered and bewildered by the thunder of the water and the assault of wind and spray; or rather, the sound is not of falling water, but merely of falling; a noise of unspecified ruin. So, if you are close behind the endless clamour, the sight cannot recognise liquid in the masses that hurl past. You are dimly and pitifully aware that sheets of light and darkness are falling in great curves in front of you. Dull omnipresent foam washes the face. Farther away, in the roar and hissing, clouds of spray seem literally to slide down some invisible plane of air.