TABLE 1 



Toxicity of different amounts of crude oil 

 mixed with carbonized sand to barnacles 



[Stiff iciert sand was added to keep the oil on the bottom] 



1/ Reaction of 80 to 90j6 of the barnacles. 

 Symbols same as Clarke (1947) as follows: 



+ 4-4 4' Normal rapid sireep of cirri 



+ + +• Full sweep but slow 



+ 4 Incomplete sweep 



+ Open, inactive, but reacts to touch 



Dead 



20 



