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



Fig. 33— Effect of surface film on fouling. A, portion of the hull of the U. S. S. New York (Norfolk, Va., April 3, l'J24), 

 showing heavy set of barnacles where paint had peeled. B, also from the New York, showing attachment of barnacles 

 on rough surface of a bryozoan colony. C and I), two test panels submerged al Beaufort, N. C, for identical periods 

 of time, both with poisons but one (C) with a rough surface and the other (D) with a smooth surface, 



