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Updated: May 7, 2025
Various English embryologists had varying success with developmental theory, but as a group they had made great impact upon the development of embryology. In the course of their century, they had, in the words of one of them, "called tradition unto experiment." Charles Dickens, A Tale of Two Cities, London, 1859, p. 1.
To disentangle such parts of their developmental changes as are due to the action of the medium, is therefore hardly possible. We can hope only to get a general conception of it by contemplating the totality of the facts. The first cardinal fact is that all protophytes are cellular all show us this contrast between outside and inside.
The tentative estimates for the fiscal year 1947 make allowance for military research, limited procurement of weapons in the developmental state, and some regular procurement of munitions which were developed but not mass-produced when the war ended.
It is beyond doubt that genetic psychology can best be advanced to-day by such work, and what is obviously true of this science is not less true of all the biological sciences which take account of the developmental or genetic relations of their events.
We have such mammalian cases as the Free-Martin cattle, and some convincing evidence of intersexuality in the human species itself, which will be reviewed presently. The notion of more "developmental energy" or a higher metabolism in males is borne out in the human species.
We may also believe that, as suggested by John Thomson, there are slight incoördinations in utero, a kind of developmental neurosis, produced by some slight lack of harmony of whatever origin, and leading to the production of malformations.
As outside forces manipulated new governments, attention was increasingly diverted from an objective consideration of developmental needs to ideological and political struggles that bore little or no relation to social or economic reality. The results were uniformly devastating.
If, in the same way, the Record asserts that man, or at least man the direct progenitor of the Semitic race, was a distinct and special creation, his bodily frame having some not completely explained developmental connection with the animal creation, but his higher nature being imparted as a special and unique creative endowment out of the line of physical development altogether, then I shall accept the Record, because the proved facts of science have nothing to say against it, whatever Drs.
In the forearm or leg, where there are two parallel bones, if the growth of one is arrested the continued growth of the other results in a deviation of the hand or foot to one side. In certain diseases, such as rickets and inherited syphilis, and in developmental anomalies such as achondroplasia, dwarfing of the skeleton results from defective growth of bone at the ossifying junctions.
Thus, that which appears probable even from the comparison of the limbs of the adult animal, finds fresh support in the developmental history, namely, that the lower Crustacea, like the Insects, are entirely destitute of the region of the body corresponding to the middle-body of the Malacostraca.
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