not, however, as far as in case of 

 Control, All Bankia dead and Lim- 

 noria tunnels empty. 



7y6 - 1.0 p pm c h lori ne, 1 hour in 6, plus temperature raised to 



HOOF, 30 minutes per week. 



new block - 3 empty Lim n ori a tunnels. No Bankia. 



6x6 panel - Panel in approximately same physical 

 condition as when placed in test. 

 Bemkia all dead and Limnoria tunnels 

 empty . 



#7 - 1.00 pp m chlorine . 1 hour in 12. 



new block - VJell filled ivith Bankia about half of 

 which were alive. 7^1 empty Lim- 

 noria tunnels. 



6x6 panel - Ppnel destroyed to nearly the same ex- 

 tent as the Control. 



#8 - 1.00 ppm chlorine . 1 hour in 12, plus temperature raised to 



110°F, 30 minutes per week. 



new block - No borers . 



6x6 panel - Panel in approximately same physical 

 condition as when placed in test. 



Three additional 6"x6" panels previously exposed to marine borer ac- 

 tivity were placed in the hot water apparatus from July 27th to Decem- 

 ber 7th according to the following schedules: 



1. Normal sea vrater. Panel well disinter<^rated. 



2. Temperature of water Destruction of vrood less than Control, 

 raised to lOO^F., 30 but more than in original condition, 

 minutes per week. 



3. Temperature of v/ater Panel in approximately same condition 

 raised to 120°F,, 30 as when placed on test. 



minutes per week. 



H - 5 



