SECTION OF COVERED-EYED MEDUSA. 69 
the outer circle, of course, continued its contractions 
as before. Now, the neck of tissue at z measured 
only one-eighth of an inch across, while the ring of 
tissue (y 2), when cut through and straightened out 
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upon the table, measured one inch across and sixteen 
inches in length; that is to say, sixteen square inches 
of tissue derived its impulse to vigorous contrac- 
tions through a channel one-eighth of an inch wide, 
