CHAP, IXx.] COMPOUND ANIMALS. 203 
plant-like body producing an egg, capable of swimming about 
and of choosing a proper place to adhere to, which then sprouts 
into branches, each crowded with innumerable distinct animals, 
often of complicated organizations? The branches, moreover, 
as we have just seen, sometimes possess organs capable of move- 
ment and independent of the polypi. Surprising as this union 
of separate individuals in a common stock must always appear, 
every tree displays the same fact, for buds must be considered 
as individual plants. It is, however, natural to consider a 
polypus, furnished with a mouth, intestines, and other organs, 
as a distinct individual, whereas the individuality of a leaf-bud is , 
not easily realised; so that the union of separate individuals in 
a common body is more striking in a coralline than in a tree. 
Our conception of a compound animal, where in some respects 
the individuality of each is not completed, may be aided, by re- 
flecting on the production of two distinct creatures by bisecting 
a single one with a knife, or where Nature herself performs the 
task of bisection. "We may consider the polypi in a zoophyte, or 
the buds ina tree, as cases where the division of the individual has 
not been completely effected. Certainly in the case of trees, and 
judging from analogy in that of corallines, the individuals pro- 
pagated by buds seem more intimately related to each other, than 
eges or seeds are to their parents. It seems now pretty well esta- 
blished that plants propagated by buds all partake of a common 
duration of life; and it is familiar to every one, what singular 
and numerous peculiarities are transmitted with certainty, by 
buds, layers, and grafts, which by seminal propagation never or 
only casually reappear. 
