HOW SPONGES LIVE. 
4' 
always pouring along the small canals, brinj 
and food to each cell along the road, while A 
water out of which the slime has taken all the ( 
gen, and into which it has thrown the hard part.-. 
refuse of its food, is driven out at the large h< 
carrying away with it all that is hurtful and USel 
Fifi 
t. 
anl 
1 *mr 
'^»<p. 
Section of an ordinary bath 5] 
a a a. Small holes where thi 
t Hows <>ut. r <-, Chambers with whip rem. 
1, A chamber enlarged shown 
Whip-cells. 
And now we can understand \ 
though a nn-n- slime animal, ia 
of the second division of In 
quite a now plan of structun 
