183 



Fig. bl. Test No. A8. Douglas fir samples treated with "AcZol" (Zinsser Co.), photographed after 

 28 months' exposure. All are considerably attacked by Limnoria. Samples 3 and 4 show also the cal- 

 careous tubes of Baiikia selacea, uncovered by Liniiwria action. At the bottom of the photograph is 

 shown a portion of the creosoted frame in which the samples were held for testing. Just above this 

 is an untreated control, exposed the same length of time, for comparison. 



