The outer coat forms a kind of mantle by means of the skirts of which the gemmule is fastened to the support of the sponge.
The terminal growing bud of the axis is called the plumule or gemmule (g), and represents the ascending axis.
We can easily conceive a being so small, that a gemmule would be to it as large as St. Paul's would be to us.
Any part of a gemmule would be an impossible (because a less than possible) quantity.
Darwin's gemmule Theory is the same guessing; and Weismann rejects it because he did not think of it first.
As a theory the gemmule plot is just as good and just as bad scientifically as Weismann's.
In some of the gemmules before me this coat measures in thickness about 1/9 of the total diameter of the gemmule.
gemmule gem·mule (jěm'yōōl)
The small bud that projects from the parent cell during gemmation.