Bull. U. S. B. F., 1927, Pt. II. (Doc. 1031.) 



Fig. 32. — Amount of fouling accumulating within CO days (May 15 to July 15, 1925) on [a board 4 [inches wide by 1 inch 

 thick and 26 inches long. A, entire board, indicating average low tide line (x); B and C, enlarged views of growths 



