[14] NOTE, 1868.—This ground still remains unimproved, it being the intention to develop the idea referred to in the report, although the plans for the structure are not yet finally decided on. * * * * * From the upper end of the promenade the rocky hill-side to the north, surmounted by Vista Rock at its highest point, comes in full view; and on this rock it will be generally conceded a tower should be erected—but by no means a large one, or the whole scale of the view will be destroyed.[15] To the north and north-west of the promenade, a tract of low ground is proposed to be converted into the skating pond called for in our instructions; and the picturesque scenery between Vista Rock and the promenade will thus be heightened in effect, when seen from the south side of this lake, of about 14 acres. A terrace approach, as shown on the plan, and on study No. 3, is proposed, from the avenue to the water.[16] This feature, although by no means absolutely necessary, would add much to the general effect, and could be introduced at any future time, if it is preferred at present to treat the ground occupied by it in a less artificial style. [15] NOTE, 1868.—The foundations for this work were commenced last season on a rocky promontory which formed a part of the Croton reservoir inclosure when it was expected to be bounded by street lines, but which has lately been added to the park territory, in accordance with our suggestion. [16] NOTE, 1868.—The architectural treatment of the terrace approach has been developed in detail during the progress of the work, but much of the intended effect still remains to be realized.