The Laboratory which ia now in the course of erection at Plymouth for the Marine Biological Association, is situated between the south wall of the “Citadel” and the Sound, at a height of 95 feet above the level of the sea. The site, which has been granted to the Association by the War Office, occupies the whole length of King Charles's Curtain, 265 feet, and extends southwards from the Citadel wall 240 ft., giving a surface of, say, 63,600 feet.