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Updated: June 15, 2025
But this power in fresh-water productions of ranging widely, though so unexpected, can, I think, in most cases be explained by their having become fitted, in a manner highly useful to them, for short and frequent migrations from pond to pond, or from stream to stream; and liability to wide dispersal would follow from this capacity as an almost necessary consequence.
The difficulty it has of accommodating itself to changed conditions probably has some connection with the very limited range or confined sphere of life of the species in its natural state, its native home being an area of swampy woods, not more than about sixty square miles in extent, although no permanent barrier exists to cheek its dispersal, except towards the south, over a much wider space.
Or, again, as was natural in Europe, where, with the exception of Basque in a corner of the west, and of certain Asiatic languages, Turkish, Hungarian and Finnish, on the eastern border, all spoken tongues present certain obvious affinities, the comparative philologist undertook to construct sundry great families of speech; and it was hoped that sooner or later, by working back to some linguistic parting of the ways, the central problem would be solved of the dispersal of the world's races.
Again he adds, "Various difficulties also remain to be solved; for instance, the occurrence, as shown by Dr. Hooker, of the same plants at points so enormously remote as Kerguelen Land, New Zealand, and Fuegia; but icebergs, as suggested by Lyell, may have been concerned in their dispersal.
It is, however, distressing to see pictures taken from the place where they have hung for centuries and sent to Christie's, to see the dispersal of old libraries at Sotherby's, and the contents of a house, amassed by generations of cultured and wealthy folk, scattered to the four winds and bought up by the nouveaux riches.
Lowder, who at this juncture reappeared, had caught his word as it dropped from him; probably not, he thought, her attention being given to Mrs. Stringham, with whom she came through and who was now, none too soon, taking leave of her. They were followed by Lord Mark and by the other men, but two or three things happened before any dispersal of the company began.
Present distribution cannot be accounted for by differences in physical conditions Importance of barriers Affinity of the productions of the same continent Centres of creation Means of dispersal by changes of climate and of the level of the land, and by occasional means Dispersal during the Glacial period Alternate Glacial periods in the North and South.
Before discussing the three classes of facts, which I have selected as presenting the greatest amount of difficulty on the theory of "single centres of creation," I must say a few words on the means of dispersal. Means of Dispersal. Sir C. Lyell and other authors have ably treated this subject. I can give here only the briefest abstract of the more important facts.
Impelled by the fine night, the groups upon the terrace were tending toward a wider dispersal, drifting over the sloping lawns by threes and couples, and I was able to identify two figures threading the paths of the garden, together, some distance below. Judging by the pace they kept, I should have concluded that Miss Ward and Mr. Cresson Ingle sought the healthful effects of exercise.
It is evident, therefore, that they have some natural means of dispersal. There is a popular idea that pigs cannot swim, but Sir Charles Lyell has shown that this is a mistake.
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