To obtain a proper conception of this plan, it is necessary to advert to geological events, in this part of the country, whose effects are very striking. The whole country takes an impress, in some degree, from the great throe which worked out a passage for the Niagara, through seven miles of solid rock, severing, at its outlet, the great coronal ridge, at its highest point of elevation. Nothing, we think, is more evident to the observer, in tracing out the Kienuka plateau, than the evidences which exist of Lake Ontario having washed its northern edge, and driven its waters against its crowning wall of limestone. The fury of the waves, forced in to the line of junction, between the solid limestone and fissile sandstone, has broken up and removed the latter, till the overlying rock, pressed by its own gravity, has been split, fissured or otherwise disrupted, and often slid in vast solid masses down the ragged precipice. Kienuka offers one of the most striking instances of this action. The fissures made in the rock, by the partial withdrawal of its support, assume the size of cavern passages; they penetrate, in some instances, under other and unbroken masses of the superior stratum, and are, as a whole, curiously intersected, forming a vast reticulated area, in which large numbers of men could seek shelter and security. A. denotes the apex of this citadel of nature. At this point, heavy masses of the limestone, rest, in part, upon the fissures, and serve as a covering. From these primary fissures, others, marked C. C. C. C. C., proceed. The distance from G. to H. is 227 paces. The cross fissure at I., thirty-seven paces.