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Updated: May 8, 2025
Their life consists in the absorption of food-particles, at any point of their surface, and in dividing into two living microbes, instead of dying, when their bulk increases. Here we have a convenient starting-point for the story of life, and may now trace the general lines of upward development.
In following the processes of digestion, all goes well with his chemistry and his mechanics till he comes to the absorption of food-particles, or their passage through the walls of the intestines into the blood. Here, the ordinary physical forces fail him, and living matter comes to his aid. The inner wall of the intestine is not a lifeless membrane, and osmosis will not solve the mystery.
These organs are the modified feet of the animal, which not only serve for sweeping food-particles into the mouth, but act also as breathing-organs.
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