Carpenter

Aggregation

Each genus is made up by aggregation of species.

Appendage

Antennæ and other appendages used for feeling.

Breed

The mother had never bred before.

Greyhounds of the best breed.

Germ

In the entire process in which a new being originates . . . two distinct classes of action participate; namely, the act of generation by which the germ is produced; and the act of development, by which that germ is evolved into the complete organism.

Secrete

Why one set of cells should secrete bile, another urea, and so on, we do not know.