CHAPTER XXXVII.
The Niagara is not a stream, not even a river; it is simply a weir sluice, a canal thirty-six miles long, which empties the waters of the Lakes Superior, Michigan, Huron, and Erie into the Ontario. The difference in the level of these last two lakes is three hundred and forty feet; this difference uniformly proportioned the whole of the width would hardly have created a "rapid;" but the Falls alone absorb half the difference in level, whence their formidable power.
This Niagarine trench separates the United States from Canada. Its right bank is American and its left English; on one side policemen, on the other not the shadow of one.
On the morning of the 12th of April, at break of day, the Doctor and I walked down the wide street of Niagara Falls, which is the name of the village situated on the banks of the Falls. It is a kind of small watering-place, three hundred miles from Albany, built in a healthy and charming situation, provided with sumptuous hotels and comfortable villas, which the Yankees and Canadians frequent in the season. The weather was magnificent, the sun warmed the cold atmosphere, a dull, distant roar was heard, and I saw vapours on the horizon which could not be clouds.
"Is that the Fall?" I asked of the Doctor.
"Patience!" replied Pitferge.
In a few minutes we were on the banks of the Niagara. The river was flowing peacefully along; it was clear, and not deep, with numerous projections of grey rock emerging here and there. The roar of the cataract grew louder and louder, but as yet we could not see it. A wooden bridge, supported by iron arches, united the left bank to an island in the midst of the current; on to this bridge the Doctor led me. Above, stretched the river as far as the eye could reach; down the stream, that is to say on our right, the first unevenness of a rapid was noticeable; then, at half a mile from the bridge, the earth suddenly gave way, and clouds of spray filled the air. This was the American fall, which we could not see. Beyond, on the Canadian side, lay a peaceful country, with hills, villas, and bare trees.
"Don't look! don't look!" cried the Doctor to me; "reserve yourself, shut your eyes, and do not open them until I tell you!"
I hardly listened to my original, but continued to look. The bridge crossed, we set foot on the island known as 
NATURE HAS COMBINED EVERYTHING TO ASTONISH THE EYE.
Page 179.
Goat Island. It is a piece of land of about seventy acres, covered with trees, and intersected with lovely avenues with carriage drives. It is like a bouquet thrown between the American and Canadian Falls, separated from the shore by a distance of three hundred yards. We ran under the great trees, climbed the slopes, and went down the steps; the thundering roar of the falls was redoubled, and the air saturated with spray.
"Look!" cried the Doctor.
Coming from behind a mass of rock, the Niagara appeared in all its splendour. At this spot it meets with a sharp angle of land, and falling round it, forms the Canadian cascade, called the "Horse-shoe Fall," which falls from a height of one hundred and fifty-eight feet, and is two miles broad.
In this, one of the most beautiful spots in the world, Nature has combined everything to astonish the eye. The fall of the Niagara singularly favours the effects of light and shade; the sunbeams falling on the water, capriciously diversify the colour; and those who have seen this effect, must admit that it is without parallel. In fact, near Goat Island the foam is white; it is then a fall of snow, or a heap of melted silver, pouring into the abyss. In the centre of the cataract the colour of the water is a most beautiful sea-green, which indicates its depth, so that the "Detroit," a ship drawing twenty feet and launched on the current, was able to descend the falls without grazing. Towards the Canadian shore the whirlpool, on the contrary, looks like metal shining beneath the luminous rays, and it is melted gold which is now poured into the gulf. Below, the river is invisible from the vapours which rise over it. I caught glimpses, however, of enormous blocks of ice accumulated by the cold of winter; they take the form of monsters, which, with open jaws, hourly absorb the hundred millions of tons poured into them by the inexhaustible Niagara. Half a mile below the cataract the river again became tranquil, and presented a smooth surface, which the winds of April had not yet been able to ruffle.
"And now for the middle of the torrent," said the Doctor to me.
I could not imagine what the Doctor meant by those words, until he pointed to a tower built on the edge of a rock some hundred feet from the shore, almost overhanging the precipice. This monument, raised in 1833, by a certain audacious being, one Judge Porter, is called the "Terrapin Tower."
We went down the steps of Goat Island, and, coming to the height of the upper course of the Niagara, I saw a bridge, or rather some planks, thrown from one rock to the other, which united the tower with the banks of the river. The bridge was but a few feet from the abyss, and below it roared the torrent. We ventured on these planks, and in a few minutes reached the rock which supported Terrapin Tower. This round tower, forty-five feet in height, is built of stone, with a circular balcony at its summit, and a roof covered with red stucco. The winding staircase, on which thousands of names are cut, is wooden. Once at the top of the tower, there is nothing to do but cling to the balcony and look.
The tower is in the midst of the cataract. From its summit the eye plunges into the depths of the abyss, and peers into the very jaws of the ice monsters, as they swallow the torrent. One feels the rock tremble which supports it. It is impossible to hear anything but the roaring of the surging water. The spray rises to the top of the monument, and splendid rainbows are formed by the sun shining on the vapourized water.
By a simple optical illusion, the tower seems to move with a frightful rapidity, but, happily, in the opposite direction to the fall, for, with the contrary illusion, it would be impossible to look at the gulf from giddiness.
Breathless and shivering, we went for a moment inside the top landing of the tower, and it was then that the Doctor took the opportunity of saying to me,—
"This Terrapin Tower, my dear sir, will some day fall into the abyss, and perhaps sooner than is expected."
Ah! Indeed!"
"There is no doubt about it. The great Canadian Fall recedes insensibly, but still, it recedes. The tower, when it was first built in 1833, was much farther from the cataract. Geologists say that the fall, in the space of thirty-five thousand years, will be found at Queenstown, seven miles up the stream. According to Mr. Bakewell, it recedes a yard in a year; but according to Sir Charles Lyell one foot only. The time will come when the rock which supports the tower, worn away by the water, will glide down the Falls of the cataract. Well, my dear sir, remember this: the day when the Terrapin Tower falls, there will be some eccentrics who will descend the Niagara with it."
I looked at the Doctor, as if to ask him if he would be of that number, but he signed for me to follow him, and we went out again to look at the "Horse-shoe Fall," and the surrounding country. We could now distinguish the American Fall, slightly curtailed and separated by a projection of the island, where there is another small central cataract one hundred feet wide; the American cascade, equally fine, falls perpendicularly. Its height is one hundred and sixty-four feet. But in order to have a good view of it it is necessary to stand facing it, on the Canadian side.
All day we wandered on the banks of the Niagara, irresistibly drawn back to the tower, where the roar of the water, the spray, the sunlight playing on the vapours, the excitement, and the briny odour of the cataract, holds you in a perpetual ecstasy. Then we went back to Goat Island to get the Fall from every point of view, without ever being wearied of looking at it. The Doctor would have taken me to see the "Grotto of Winds," hollowed out underneath the central Fall, but access to it was not allowed, on account of the frequent falling away of the rocks.
At five o'clock we went back to the hotel, and after a hasty dinner, served in the American fashion, we returned to Goat Island. The Doctor wished to go and see the "Three Sisters," charming little islets scattered at the head of the island; then, with the return of evening, he led me back to the tottering rock of Terrapin Tower.
The last rays of the setting sun had disappeared behind the grey hills, and the moon shed her soft clear light over the landscape. The shadow of the tower stretched across the abyss; farther down the stream the water glided silently along, crowned with a light mist. The Canadian shore, already plunged in darkness, contrasted vividly with the moon-lit banks of Goat Island, and the village of Niagara Falls. Below us, the gulf, magnified by the uncertain light, looked like a bottomless abyss, in which roared the formidable torrent. What effect! What artist could ever depict such a scene, either with the pen or paint-brush? For some minutes a moving light appeared on the horizon; it was the signal light of a train crossing the Niagara bridge at a distance of two miles from us. Here we remained silent and motionless on the top of the tower until midnight, leaning over the waters which possessed such a fascination. Once, when the moon-beams caught the liquid dust at a certain angle, I had a glimpse of a milky band of transparent ribbon trembling in the shadows. It was a lunar rainbow, a pale irradiation of the queen of the night, whose soft light was refracted through the mist of the cataract.