I am just arived at this place from N. York where I have conversed with Gen. l Washington on the purport of the Letter from the secret Committee— Gen s Putnam and Mifflin have made an exact survey of the River opposite Mount Washington and find that the depths in no part exceeds 7 fathoms—the width however of the Channel (which is from 3 to 7 F. s ) is not much less than 1000 Yd s . the...