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105 rows, page 27 of 27 (4/p)
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Export to Excel select * from OriginOfSpecies where subject = '04 - Natural Selection' order by description limit 104, 4 (Page 27: Row)
description Desending Order (top row is first)
04 - Natural Selection 04-12 - On the Degree to which Organisation tends to advance 50 Whether organisation on the whole has actually advanced from the remotest geological periods to the present day will be more conveniently discussed in our chapter on Geological Succession.

But it may be objected that if all organic beings thus tend to rise in the scale, how is it that throughout the world a multitude of the lowest forms still exist; and how is it that in each great class some forms are far more highly developed than others?

Why have not the more highly developed forms everywhere supplanted and exterminated the lower?

Lamarck, who believed in an innate and inevitable tendency towards perfection in all organic beings, seems to have felt this difficulty so strongly, that he was led to suppose that new and simple forms are continually being produced by spontaneous generation.