[On the Genesis of Species by St. George Mivart]@TWC D-Link bookOn the Genesis of Species CHAPTER XI 15/17
'Derivation' sees therein a narrow invocation of a special miracle and an unworthy limitation of creative power, the grandeur of which is manifested daily, hourly, in calling into life many forms, by conversion of physical and chemical into vital modes of force, under as many diversified conditions of the requisite elements to be so combined." The view propounded in this work allows, however, a greater and more important part to the share of external influences, it being believed by the Author, however, that these external influences equally with the internal ones are the results of one harmonious action underlying the whole of nature, organic and inorganic, cosmical, physical, chemical, terrestrial, vital, and social. According to this view, an internal law presides over the actions of every part of every individual, and of every organism as a unit, and of the entire organic world as a whole.
It is believed that this conception of an internal innate force will ever remain necessary, however much its subordinate processes and actions may become explicable: That by such a force, from time to time, new species are manifested by ordinary generation just as _Pavo nigripennis_ appeared suddenly, these new forms not being monstrosities but harmonious self-consistent wholes.
That thus, as specific distinctness is manifested by obscure sexual {240} conditions, so in obscure sexual modifications specific distinctions arise. That these "jumps" are considerable in comparison with the minute variations of "Natural Selection"-- are in fact sensible steps, such as discriminate species from species. That the latent tendency which exists to these sudden evolutions is determined to action by the stimulus of external conditions. That "Natural Selection" rigorously destroys monstrosities, and abortive and feeble attempts at the performance of the evolutionary process. That "Natural Selection" removes the antecedent species rapidly when the new one evolved is more in harmony with surrounding conditions. That "Natural Selection" favours and develops useful variations, though it is impotent to originate them or to erect the physiological barrier which seems to exist between species. By some such conception as this, the difficulties here enumerated, which beset the theory of "Natural Selection" pure and simple, are to be got over. Thus, for example, the difficulties discussed in the first chapter--namely, those as to the origins and first beginnings of certain structures--are completely evaded. Again, as to the independent origin of closely similar structures, such as the eyes of the Vertebrata and cuttle-fishes, the difficulty is removed if we may adopt the conception of an innate force similarly directed in each case, and assisted by favourable external conditions. Specific stability, limitation to variability, and the facts of reversion, all harmonize with the view here put forward.
The same may be said with regard to the significant facts of homology, and of organic symmetry; and our consideration of the hypothesis of Pangenesis in Chapter X., has seemed to result in a view as to innate powers which accords well with what is here advocated.
[Page 241] The evolutionary hypothesis here advocated also serves to explain all those remarkable facts which were stated in the first chapter to be explicable by the theory of Natural Selection, namely, the relation of existing to recent faunas and floras; the phenomena of homology and of rudimentary structures; also the processes gone through in development; and lastly, the wonderful facts of mimicry. Finally, the view adopted is the synthesis of many distinct and, at first sight, conflicting conceptions, each of which contains elements of truth, and all of which it appears to be able more or less to harmonize. Thus it has been seen that "Natural Selection" is accepted.
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