This was done by means of two stakes securely fixed in the sand. Then the settlers, ascending the banks of the Mercy, soon arrived at the angle formed by the river.
There they halted, in order to ascertain if the bridge could be thrown across. The place appeared suitable. In fact, from this spot, to Port Balloon, discovered the day before on the southern coast, there was only a distance of three miles and a half, and from the bridge to the Port, it would be easy to make a good cart-road which would render the communication between Granite House and the south of the island extremely easy.
Harding now imparted to his companions a scheme for completely isolating Prospect Heights so as to shelter it from the attacks both of quadrupeds and quadrumana. In this way, Granite House, the Chimneys, the poultry-yard, and all the upper part of the pleateau which was to be used for cultivation, would be protected against the depredations of animals. This is how the engineer intended to set to work.
The plateau was already defended on three sides by watercourses, either artificial or natural. On the north-west, by the shores of Lake Grant, from the entrance of the passage to the beach made in the banks of the lake for the escape of the water. On the north, from this breach to the sea, by the new watercourse which had hollowed out a bed for itself across the plateau and shore, above and below the fall, and it would be enough to dig the bed of this creek a little deeper to make it impracticable for animals. On all the eastern border by the sea itself, from the mouth of the creek to the mouth of the Mercy. Lastly, on the south, from the mouth to the turn of the Mercy where the bridge was to be established.
The western border of the plateau now remained between the turn of the river and the southern angle of the lake, a distance of about a mile, which was open to all comers. But nothing could be easier than to dig a broad deep ditch, which could be filled from the lake, and the overflow of which would throw itself by a rapid fall into the bed of the Mercy. The level of the lake would, no doubt, be somewhat lowered by this fresh discharge of its waters, but Cyrus Harding had ascertained that the volume of water in
