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Updated: June 20, 2025
It remained visible for a few days, and, from Oppenheim's and Hind's calculations, there can be little doubt that it was really the offspring by fission of the body it accompanied.
On the other hand, Harvey's dictum, "Every living thing comes from an egg," is only true in a limited sense, namely, that whilst the individual among most larger animals and plants is always traceable to an egg-cell detached from a parental individual of a like kind of species, there are whole groups and series of lower animals and most plants in which the individual born or "developed" from an egg-cell does not proceed when grown to full size to reproduce in turn by eggs and fertilising sperms, but divides into two or more individuals or gives off detached buds or reproductive bulbs, which become separate individuals, and only after these and several successive generations of individuals have been thus produced "asexually," by fission or by budding, does a generation appear which produces true egg-cells and sperm-cells and reproduces by their means.
The United States, indeed, is still in the process of fusion following the earlier fission process. It has not yet reached the stability that comes to some nations in history, and which is marked by a fixed pattern of population growth, land use, day-to-day habits, and philosophic beliefs.
The bacteria multiply by the simple process of growing longer and splitting into two, fission, as it is called, and the process is so rapid that within an hour or two after being formed a bacterium may be raising a family of its own. Some of the milk brought to the cities contains as many as 15,000,000 bacteria per cubic centimeter, that is, about 600,000 per drop.
Perhaps the most convincing and beautiful illustration of the truth of this vital and all important proposition is, that the reproductive cells of man in his highest state of development, multiply by fission, or self-division into halves, as did the primal sperm of protoplasm at the very beginning of vegetable and animal life.
"An American named John Snyder had, years before, secretly worked out a simple and inexpensive method of obtaining practically unlimited power directly from atomic fission. Now he could legally bring this to the public, and soon homes, public transportation and industry were using his power method. "Snyder attracted to him a group of gifted scientists and technicians.
Two long cilia protrude through the cell-wall, and effect the rapid locomotion of this "monad," which, in all respects except its mobility, is characteristically a plant. Under ordinary circumstances, the Chlamydomonas multiplies by simple fission, each splitting into two or into four parts, which separate and become independent organisms.
It is the embryo of a new Sun and his planets. After many million years of molecular agony, when his season of fission had come, he will rend huge fragments from his mass and hurl them helpless into space, there to grow into his satellites.
The apparent suddenness of the appearance of multitudes of such organisms as these in any nutritive fluid to which one obtains access is thus easily explained. During these processes of multiplication by fission, the Heteromita remains active; but sometimes another mode of fission occurs.
Often the two generations, reproducing, the one by fission, the other by egg and sperm-cells, are alike in appearance, but often they are very different, and have naturally been supposed at first to have nothing to do with each other.
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