186 



Fig. 65. Test No. AlO. Douglas fir samples treated by Arent Laboratories with benzol antimony 

 trichloride (No. 2) and creosote antimony trichloride (No. 3), after 28 months' e.vposure. Both heavily 

 attacked by Limnoria. No. 1 is a portion of the creosoted frame, and No. 4 an untreated control. 



