This furrow or crease will receive the food.

Insensibly this little furrow by the habit of being filled, and by the so frequent use of its pores, will gradually increase in depth; it will soon assume the form of a pouch or of a tubular cavity with porous walls, a blind sac, or with but a single opening.

Behold the primitive alimentary canal created by nature, the simplest organ of digestion." In like _a priori_ manner he describes the creation of the faculty of reproduction.

The next organ, he says, is that of reproduction due to the regenerative faculty.

He describes fission and budding.