U. S. B. F— Doc. 947. 



Yvi. 16.— Cotton lines exposed in sea water at Beaufort, N. C, for four mouths. Heavily 

 fouled. J, petroleum product No. 1; I, quercitron and potassium bichromate. 



i'lG. 17.— Cotton lines exposed in sea water at Beaufort, N. C, for four months. No 

 fouling. AH had been treated with copper oleate. 



