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Updated: June 15, 2025
There are special forms of cells besides those described; nettle cells for capturing food, interstitial cells, etc., but these do not concern us. The distance from the single-celled amoeba to hydra is vast, probably really greater than that between any other successive terms of our series.
These same main divisions of soul-activity, which are to be met with in the single-celled organism, the phenomena of irritability, sensation, and motion, can be shown to exist in all multicellular organisms as functions of the cells of which their bodies are composed.
A name given to certain substances, such as soda, potash, and the like, which have the power of combining with acids. Pertaining to the alveoli, the cavities for the reception of the teeth. A single-celled, protoplasmic organism, which is constantly changing its form by protrusions and withdrawals of its substance. Amoeboid. Like an amoeba.
Of course the division of one being to form two is perfectly familiar in the case of those lowly, single-celled creatures such as the protozoa and the bacteria, but it seems quite another matter when one thinks of cutting a fish in two and having two complete living fish remaining. Yet this is virtually what the biologists did.
It is a source of evidence that has told us of most of the steps in the progress from the single-celled animal to the multicellular organisms, and gives us the clearest idea of the fundamental principles which have been concerned in the evolution of life and the construction of the complicated machine out of the simple bit of protoplasm.
You will also see on this side several cells in which these tiny spores are forming, ready to burst out and swim; for this green weed is merely a collection of cells, like the single-celled plants on land. Each cell can work as a separate plant; it feeds, grows, and can send out its own young spores.
It stood out sharply when he focused the white, jellyfish shape of a single-celled leucocyte. To his untrained eye there was nothing unusual about it. He couldn't know what was strange, when he had no idea of what was normal. "Do you see those spherical green shapes grouped together?" Lea asked. Before Brion could answer she gasped, "I remember now!" Her fatigue was forgotten in her excitement.
Far from outgrowing what we know as human love, we add thereunto a million fold, refining, purifying and intensifying the sex instinct until it bears a relationship to the average instance of sex-expression, analogous to that which the single-celled organism bears to intellectual man.
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