82 
LECTURE Vm. 
state : the result of these inquiries seemed to 
prove a species of real internal lungs; but the 
more accurate researches of others have since 
proved that these supposed lungs were no other 
than a particular kind of vesicular processes which 
the animal has the power of occasionally inflating 
in order to render itself specifically lighter and 
to ascend at pleasure with the greater facility. 
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. . i I 
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