United States or Qatar ? Vote for the TOP Country of the Week !
The strongest apparent exception to this latter rule, is that of the so-called "colonies" of M. Barrande, which intrude for a period in the midst of an older formation, and then allow the pre-existing fauna to reappear; but Lyell's explanation, namely, that it is a case of temporary migration from a distinct geographical province, seems to me satisfactory.
From these peculiarities and from the lens-form of the strata, it is probable that this great pile of strata was accumulated on a shallow and very uneven bottom, near some pre-existing land formed of various porphyries and quartz-rock.
And hence knowledge directly conducing to the first, must take precedence of knowledge directly conducing to the last. Those various forms of pleasurable occupation which fill up the leisure left by graver occupations the enjoyments of music, poetry, painting, etc. manifestly imply a pre-existing society.
It is obvious, from these extracts, that Professor Kolliker's hypothesis is based upon the supposed existence of a close analogy between the phenomena of Agamogenesis and the production of new species from pre-existing ones. But is the analogy a real one? We think that it is not, and, by the hypothesis, cannot be. For what are the phenomena of Agamogenesis, stated generally?
This effort cannot result in the creation of energy, or, if it does, the quantity created does not belong to the order of magnitude apprehended by our senses and instruments of measurement, our experience and science. All that the effort can do, then, is to make the best of a pre-existing energy which it finds at its disposal.
On the other hand, I see no good reason for doubting the necessary alternative, that all these varied species have been evolved from pre-existing crocodilian forms by the operation of causes as completely a part of the common order of nature as those which have effected the changes of the inorganic world.
If, on the other hand, we adopt that hypothesis to which alone the study of physiology lends any support that hypothesis which, having struggled beyond the reach of those fatal supporters, the Telliameds and Vestigiarians, who so nearly caused its suffocation by wind in early infancy, is now winning at least the provisional assent of all the best thinkers of the day the hypothesis that the forms or species of living beings, as we know them, have been produced by the gradual modification of pre-existing species then the existence of persistent types seems to teach us much.
Nothing could be more false than the rumour which once arose that he superintended those performances of his plays which took place under the direction of the Society. Once only, and by the urgent desire of some of the actors, did he witness a last rehearsal of one of them. It was also a matter of course that men and women brought together by a pre-existing interest in Mr.
Circumstantial evidence is occasionally very convincing, as when you find a trout in the milk, to quote Thoreau's example." "But I have heard all that you have heard." "Without, however, the knowledge of pre-existing cases which serves me so well. There was a parallel instance in Aberdeen some years back, and something on very much the same lines at Munich the year after the Franco-Prussian War.
But if you take that plug out and give the air free access, then, sooner or later fermentation will set up. And there is no doubt whatever that fermentation is excited only by the presence of some torula or other, and that that torula proceeds in our present experience, from pre-existing torulae. These little bodies are excessively light.
Word Of The Day