46 



American Fisheries Society. 



M0MTH5 EX?OJED 



Fig. 4. — Tensile strength of cotton lines exposed to sea water at 

 Key West, Florida. Grouped. 



G. H) the three tars; (I) BulKs method; (J) Petroleum Product 

 No. 1; (L) Dutch method; (M, N, O, P) copper oleate in four 

 variations ; (Q, R) two commercial copper paints recommended 

 as net preservatives; (S) Gilsonite; and (X) Petroleum Product 

 No. 2, a new formula under the same name as (J). Of these A, 

 F, G, H, I and J are the same as were used at Key West and in 

 Washington. M, N, O and P, while still copper oleate, were 

 not of exactly the same concentrations as those formerly used; 

 Q and R, the copper paints, are here studied for the first time. 

 S, Gilsonite, a proprietary preservative and X, the Petroleum 

 Product of new formula, are here first studied. Here again the 

 preserved lines fall into five groups, which are shown graphically- 

 for the average of each group in Fig. 6. The strongest group is 

 Q and R, the commercial copper paints, where a tarry binder is 



