Of these organisme, hydroids and barnacles occurred with great fi*equency,^ 

 the latter "being very abundant, while the occurrence of the other organisms 

 was merely sporadic or occasional. Algae also occurred with considerable 

 frequency on the panels of the test series. . 



3. Becent Addenda . Panels of a new test board installed October 6, 

 19kd, ' has shown no Teredinidae and only a slight Limnoria attack up to the 

 end of 19^9. 



IU2 



