Sir,

I have the honor to state that the Pendulum work of this Survey has so far advanced in this country as to require renewed comparisons of the observations of our work with observations at certain of the initial stations in Europe at which the pendulum work of all the great Geodetic Surveys has been compared. Gravity determinations by the use of the Pendulum form one of the most essential parts of a Geodetic Survey, and the value of these determinations depends on their being bound together, each with all the others that have been made anywhere on the earth. Hence the necessity of initial points for common reference of all instruments used. Geodesy is said to be the one science the successful prosecution of which absolutely depends