By Charles Darwin
Charles Darwin challenged the various so much deeply-held ideals of the western international. Arguing for a cloth, no longer divine, beginning of species, he confirmed that new species are accomplished via 'natural selection'.
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Additional resources for The Origin of Species
De Candolle and others have shown that plants which have very wide ranges generally present varieties; and this might have been expected, as they become exposed to diverse physical conditions, and as they come into competition (which, as we shall here after see, is a far more important circumstance) with different sets of organic beings . But my tables further show that, in any limited country, the species which are most common, that is abound most in individuals, and the species which are most widely diffused within their own country (and this is a different consideration from wide range, and to a certain extent from commonness) , often give rise to varieties sufficiently well-marked to have been recorded in botanical works .
But if he confine his attention to one class within one country, he will soon make up his mind how to rank most o f the doubtful forms . H i s general tendency will be to make many species, for he will become impressed, just like the pigeon or poultry fancier before alluded to, with the amount of difference in the forms which he is continually studying; and he has little general knowledge of analogical variation in other groups and in other countries, by which to correct his first impressions .
In a breed which has been crossed only once with some distinct breed, the tendency to reversion to any character derived from such cross will naturally become less and less, as in each succeeding generation there will be less of the foreign blood; but when there has been no cross with distinct breed, and there is a tendency in both parents to revert to a character, which has been lost during some former generation, this tendency, for all that we can see to the contrary, may be transmitted undiminished for an indefinite number of generations.
The Origin of Species by Charles Darwin