CORALLING, 231 
communication with the polyps. The alimentary fluids élaborated 
by the polyps pass into the branches of the secondary and -irregular 
network ‘system, in order to reach the great parallel tubes which 
extend from one extremity of.the organism to the other, serving the 
same purpose to the whole community.. 
‘ 
‘Fig. 88.—Circulating Apparatus for the nutritive fluids inthe Coral (Lacaze-Duthiers). 
a \ 4 
_ When the extremity of a branch of living coral is torn or broken, , 
a white liquid immediately flows from the wound, which mingles. 
with water, and presents all the appearance of milk. This is the- 
fluid aliment which has escaped from the vessel containing it, charged 
with the déérzs of the organism. ; 
What occurs when the bud produces. new polyps? . It. is only. 
