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In other cases two plants are so closely allied that some botanists class them as varieties (as with Matthiola annua and M. For processing short-length wool fibers its mechanization proved most difficult to achieve. But even those, such as Lyell, who most strenuously argued in favour of the sufficiency of natural causes for the production of the phenomena of the inorganic world, held stoutly by the hypothesis of creation in the case of those of the world of life. Thus, the more complete the sterility of the hybrids the more rapidly will they die out and leave the two parent forms pure. Originally, perhaps, like the highest crater of Etna, it may have formed an insignificant feature in the great pile, and, like it, may frequently have been destroyed and renovated.