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Updated: May 7, 2025
In this way, with what difficulties I need not weary you, a complete life-cycle was made out. And now I will invite your attention to the developmental history of the most minute of the six forms we studied. In form it is a long oval, it is without visible structure or differentiation within, and is possessed of only a single flagellum. Its utmost length is the 1/5000 of an inch.
You might define the life of every one in exactly the same terms as those which I have now used; the difference between the highest and the lowest being simply in the complexity of the developmental changes, the variety of the structural forms, and the diversity of the physiological functions which are exerted by each.
Darwin are strictly to the point as regards all ordinary developmental and metamorphic changes, and even as regards transmitted acquired actions, and tricks acquired before the time when the offspring has issued from the body of the parent, or on an average of many generations does so; but it cannot for a moment be supposed that the offspring knows by inheritance anything about what happens to the parent subsequently to the offspring's being born.
Aside from the exceptions given above and even they are partial exceptions only creative power depends on the ability to understand, which imposes upon it its form and developmental law. In literature and in the arts comparison between the simplicity of primitive creations and the complexity of advanced civilizations has become commonplace.
Next let us note that psychologists always adduce the same examples when they wish to illustrate on the one hand, the processes of the persistent, tenacious attention, and, on the other hand, the developmental labor without which creative work does not come to pass: "Genius is only long patience," the saying of Newton; "always thinking of it," and like expressions of d'Alembert, Helmholtz and others, because in the one case as in the other the fundamental condition is the existence of a fixed, ever-active idea, notwithstanding its relaxations and its incessant disappearances into the unconscious with return to consciousness.
According to this, the cells resulting from the subdivision of the germ-cell preserve their developmental force, unless employed in building up definite organic structures. In certain creatures, and in certain parts of other creatures, germ-cells unused are stored up, and by their agency lost limbs and other mutilations are repaired.
Perhaps some one else, more fortunate than myself, may be able, even without Darwin, to find the guiding clue through the confusion of developmental forms, now so totally different in the nearest allies, now so surprisingly similar in members of the most distant groups, which we have just cursorily reviewed.
Dave made his father his hero, and for many years was instant in doing his will. Had the older man taken serious thought of his son's personality and entered into the boy's developmental needs with his wonted intelligence and thoroughness, the two could have grown into a closeness which would have made the Scott name one to be reckoned with in the manufacturing world.
Still more wonderful is the fact that the larger complex organisms actually begin existence as single cells. In three ways, therefore, the analytic, the comparative, and the developmental, the cell proves to be the "organic individual of the first order." As the ultimate biological unit, its essential nature must possess a profound interest, for in its substance resides the secret of life.
It is difficult to resist the impression that in another hundred years,—perhaps again from the standpoint of new and definitely accepted mechanical explanations,—people will regard our developmental mechanics, cellular mechanics, and other vital mechanics much in the same way as we now look on Vaucanson’s duck.
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