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The law of fluid pressure divide the different forms of organized bodies by the form of attraction and the number increased will be the form. Inertia is that property of bodies by virtue of which it cannot change its own condition of rest or motion. In other words it is the negative quality of passiveness either in recoverable latency or insipient latescence.
It assumes pairs of characters and calls the active unit of the pair dominant, and the latent recessive, without further investigations of the question of latency. It was worked out by Mendel for a large group of varieties of peas, but it holds good, with only apparent exceptions, for a wide range of cases of crosses of varietal characters.
The thornless horse-chestnut has in some instances such evident protuberances on the valves of its fruits, that it may seem doubtful whether it is a pure and stable variety. Systematic latency may betray itself in different ways, either by normal systematic marks, or by atavism.
Turn the fear over as I will in my mind, it all seems to lead back to two unwillingnesses of the imagination, one aesthetic, and the other moral; unwillingness, first to envisage a future in which army-life, with its many elements of charm, shall be forever impossible, and in which the destinies of peoples shall nevermore be decided, quickly, thrillingly, and tragically, by force, but only gradually and insipidly by "evolution"; and, secondly, unwillingness to see the supreme theatre of human strenuousness closed, and the splendid military aptitudes of men doomed to keep always in a state of latency and never show themselves in action.
If we take for instance the broom-rape or Orobanche, or some other pale parasite, we explain their occurrence in families of plants with green leaves, by the loss of the leaves and of the green color. But evidently this loss is not a true one, but only the latency of those characters.
Evolution is a struggle for, and a conquest of, space; for evolution, as the word implies, is a drawing out of what is inherent from latency into objective reality, or in other words into spatial and temporal extension. This struggle for space, by means of which the birth and growth of organisms is achieved, is the very texture of life, the plot of every drama.
Latency, from this point of view, must be one of the most common things in nature. All organisms are to be considered as internally formed of a host of units, partly active and partly inactive. Extremely minute and almost inconceivably numerous, these units must have their material representatives within the most intimate parts of the cells.
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