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Updated: May 15, 2025
But the case is very different; and Alph. de Candolle has well remarked, in his great and admirable work, that floras gain by naturalisation, proportionally with the number of the native genera and species, far more in new genera than in new species. To give a single instance: in the last edition of Dr.
We see the same fact in ascending mountains, and sometimes it is quite remarkable how abruptly, as Alph. De Candolle has observed, a common alpine species disappears. The same fact has been noticed by E. Forbes in sounding the depths of the sea with the dredge.
Professor Wilton was a Phi Alph. From that time he was spoken of as "the only Phi Alph Virgin." The periods when I had rested secure in the knowledge of where my next meal was coming from, had been few. Life had pressed me close to its ragged edge ever since I could remember. Now I was accorded a temporary relief.
Again, islands often possess trees or bushes belonging to orders which elsewhere include only herbaceous species; now trees, as Alph. de Candolle has shown, generally have, whatever the cause may be, confined ranges.
This fact, together with the seeds and eggs of many low forms being very minute and better fitted for distant transportation, probably accounts for a law which has long been observed, and which has lately been admirably discussed by Alph. de Candolle in regard to plants, namely, that the lower any group of organisms is, the more widely it is apt to range.
There is for instance Poe's ``Dark tarn of Auber, the ghoul-haunted region of Weir''; there are some queer twists in the river Alph as imagined by Coleridge; two lines of Swinburne: By the tideless dolorous inland sea In a land of sand and ruin and gold are as haunting as any.
Being familiar with the fact that many species, naturalised through man's agency, have spread with astonishing rapidity over new countries, we are apt to infer that most species would thus spread; but we should remember that the forms which become naturalised in new countries are not generally closely allied to the aboriginal inhabitants, but are very distinct species, belonging in a large proportion of cases, as shown by Alph. de Candolle, to distinct genera.
So, again, I do not doubt that some apparent correlations, occurring throughout whole orders, are entirely due to the manner alone in which natural selection can act. For instance, Alph.
This is strikingly shown, as remarked by Alph. de Candolle, in large groups of terrestrial plants, which have only a very few aquatic members; for these latter seem immediately to acquire, as if in consequence, a very wide range. I think favourable means of dispersal explain this fact.
It is enough, in the way of obviating objections, to show that the philosophical difficulties of the one are the same, and only the same, as of the other. Etude sur l'Espece, a l'Occasion d'une Revision de la Famille des Cupuliferes, par M. ALPHONSE DE CANDOLLE. This is the title of a paper by M. Alph. De Candolle, growing out of his study of the oaks.
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