Sinopsis
Excerpt from The Origin of Life
In this lesson we shall aim to answer the question: How do new beings come into existence? People once thought that in fermenting or decaying substances certain minute living forms came into existence spontaneously; that is, that live things were produced just by the process of decay. But the micro scope has revealed to us the details of the life of the tiny beings that exist in decaying things, and we now know that these lowly forms, as well as the plants and animals of more complex structure, come from preceding living beings of the same kind. Life comes only from life.
The living substance of every plant or animal resembles the raw White of egg. It is called protoplasm. It exists in tiny specks or sacks called cells. These cells, together with the few substances that lie between them, compose the bodies of all plants and animals. The word animal includes all species, from the microscopic forms which live in the water to the highest and most complex, man. The number of such cells in one person is almost beyond imagination. In one joint of the finger there are perhaps possibly twice that num ber. Yet all the cells of various kinds and unimaginable num ber, composing the body of any plant or animal, came into existence by a process of growth from the protoplasm of a single cell. The methods of that process are the first things we shall study.
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