[ I0 3 ] 
all the good coral-fi fliers take for the real milk of the 
coral ; the rather, becaufe, by prefling the bark of 
the coral with the fingers, the polypus is forced out, 
and, in coming forth, it always retains the appearance 
of milk. And this makes me believe likewife, that the 
accurate Andreas Caefalpinus, who was the firft ob- 
ferver of milk in coral, in reality faw nothing but 
the polypi in the likenels of milk. 
§ 32. Altho’ the polypi have their belly (Fig. A 7 . 
g.) quite difengaged from the cellule, as we have 
laid above ; yet they always keep it therein, fhorten- 
ing and widening it fo, as to make it bigger than the 
mouth or opening of the cellule (S.g,): and this 
may be feen very diftin&ly, by feparating the cellule 
and its polypus from the fubftance of the coral, and 
then obferving it on the back part. In this attitude 
it is, that we fee, not only the belly very much 
fhortened (Fig. S. g,) but alfo the poflure, in which 
the polypus keeps itfelf in its own habitation. 
§ 33. At the bottom of the belly (A 7 #,) offome 
polypi, I have obferved fome roundifli by da tides, ex- 
tremely fmall and foft, tranfparent, yellowifh, or 
tending to pale. The fituation and figure of thefe 
hydatides induce me to believe, that they are the 
true eggs of the polypus. 
§ 34. Altho’ the fize of thefe eggs is not much 
above the fortieth part of a line, yet, by the aflifl- 
ance of a good microfcope, I think I have difcover’d 
therein fome veftiges of little grains, like thofe, which 
are common on the bark and fubflance of coral. 
Thefe eggs are detached from the polypus , and, be- 
ing foft, they adapt themfelves, and flick to the hard 
bodies, on which they fall. Afterwards they fpread 
at 
