The board of commissioners in whose charge is placed the projected trigonometrical survey of New York State report that preparations have been made for beginning the work in ten counties westward from the line of the upper Hudson river to Seneca lake. The starting points are the four United States Coast Survey stations at Mt. Rafinesque, near Troy, Helderberg, Princetown, and Greenwich. The position of these points has been very accurately ascertained by means of two independent lines of triangles carried from New England and Fire Island through Connecticut and Massachusetts. The State Survey, therefore, enjoys the advantage of starting from points that belong to the great chain of stations established by the general Government, and these are so placed that the first line of triangles which crosses the State will connect directly with another chain of similar stations on the great lakes. The plan followed includes the selection of prominent elevations of land for principal stations. An earthen vessel of peculiar shape and markings will be sunk below the first line, and its centre clearly marked. Above this will be placed a squared stone projecting from the ground. The latter will be the visible base of operations in common use, but the former will be the permanent and authoritative reference in case of any difficulty or doubt. It is intended to establish these points about twelve miles apart, and their positions will be determined by careful astronomical observations, checked by accurate measurements of their distance from neighboring stations. Wherever the nature of the ground compels the placing of these stations at distances inconveniently great, subordinate points will be established in the intermediate ground. In the present working ground the highlands which bound the Mohawk valley on the north and south afford admirable positions for these stations.