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Updated: May 17, 2025
For, whether found in the canals of the sponge themselves, or embedded in the sponge-substance, the living sponge-particles are represented each by a semi-independent mass of protoplasm. So that the first view I would have you take of the sponge as a living mass, is, that it is a colony and not a single unit.
Now, the living parts of this dried cast-away sponge were found both in its interior and on its surface. They lined the canals that everywhere permeate the sponge-substance, and microscopic examination has told us a great deal about their nature. The egg. 2, 3, and 4. The process of egg-division. 5 and 6. The gastrula-stage. 7.
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