44 



American Fisheries Society. 



a 32 



y so 



55 



26 



16^ 



WEEKS EXPOSU- 



Fig. 3. — Tensile strength of cotton lines exposed to sea water at 

 Key West, Florida. 



which contain a protecting body and toxic creosote are effective ; 

 the toxic copper oleate is effective ; the Dutch method, containing 

 as it does, copper, is eft'ective ; the others, Bull's method, water- 

 proofing material and Petroleum Product No. 1 (the two latter 

 are bituminous or tarry, but appear to contain no toxic proper- 

 ties), have no preserving properties, as far as tensile strength 

 is concerned. 



