180 HISTORY OF BRITISH ZOOPHYTES. 
crisis, and the larger, making a wide mouth, swallows the 
smaller one, worm and all. You would imagine that he 
who has been swallowed by an enemy whose very touch has 
so often proved deadly, might be numbered with the dead, 
and would never appear on the field again. Point du tout. 
Watch the victor for a little, and you will find that ere an 
hour elapses he again opens his wide mouth, and disgorges 
from his greedy maw his imprisoned victim, minus the worm, 
which the conqueror has by this time digested, but other- 
wise unscathed, and as ready as ever to pursue his prey, and 
to assert his right to it when it is captured ! 
M. Trembley learned, in the course of his observations, 
that these little Hydre are very prolific. When the tempe- 
rature was mild and nourishment abounded, a single polype 
produced about twenty offsets or young ones in a month. 
But then these twenty form not the whole product, for every 
one of the young ones, when disjoined, becomes as fertile as 
the mother. Nay, it very often happens that they begin to 
be prolific before they are separated from the mother ; and as 
the mother polype has several offshoots appended to her at 
the same time, and they also may be each yielding offspring, 
she is thus laden at once with two generations,—mother and 
children and grandchildren fastened together and appearing 
like a little branching shrub. 
