It is unnecessary to follow, step by step, the operations of Stevenson and his “undaunted band.” Such details would possess no interest for the general reader; but he will understand how great must have been the skill and perseverance of the engineer, how arduous the industry of all engaged, when we record that by the 25th of August the solid part of the building had been raised to the height of 31½ feet above the rock, and of 17 feet above high-water of spring tides. * * * * * Having during two seasons landed and built up more than one thousand four hundred tons of stone, while the work was low down in the water, and before the beacon had been rendered inhabitable, and as not more than seven hundred tons were required to complete the masonry, Mr. Stevenson had good reason to conclude that another season would consummate his enterprise. But the success of the work absolutely depending on the stability of the beacon, he paid frequent visits to the rock in the course of the winter, to see that it braved unhurt the fury of winds and waves. [Illustration: THE BUILDING OF THE BELL ROCK LIGHTHOUSE.] The operations of the fourth and last season were commenced on the 10th of May. The artificers took permanent possession of the beacon, which consisted at this time of three floors—one occupied as the cook-house and provision store; the second divided into two cabins, one for the engineer and the other for the foreman; and the third provided with three rows or tiers of beds, capable of accommodating about thirty men. Below these three floors was a temporary floor, at the height of twenty-five feet above the rock, used for preparing mortar, and for the smith’s workshop. The beacon was connected with the lighthouse by a bridge of timber. The apartment which Mr. Stevenson himself occupied he has described in characteristic language.