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Fig. 63. Test No. A7. Douglas fir samples treated with Williams and Francois oil, photographed 

 after 28 months' exposure. Sample at left shows heavy Limnoria attack. Sample at right shows initial 

 Limnoria attack, as indicated by arrows. The other depressions in the surface of this sample are knots. 

 Barnacles were scraped from this sample before photographing. Sample at bottom of photograph is 

 a part of the creosoted frame in which the samples were held for testing; it showed no attack, the hole 

 in the center being a bolt hole. 



