Origin of Species… • Historical sketch… (20-21)

≣  •  D a r w i n  (1 8 5 9,  1 8 7 2⁶)  •  … o f  t h e  p r o g r e s s  o f  o p i n i o n …  •  √it

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In 1853 a celebrated geologist, Count Keyserling (‹Bulletin de la Soc. Géolog.›, 2nd Ser., tom. x. p. 357), suggested that as new diseases, supposed to have been caused by some miasma, have arisen and spread over the world, so at certain periods the germs of existing species may have been chemically affected by circumambient molecules of a particular nature, and thus have given rise to new forms.

In this same year, 1853, Dr. Schaaffhausen published an excellent pamphlet (‹Verhand. des Naturhist. Vereins der Preuss. Rheinlands›, &c.), in which he maintains the progressive development of organic forms on the earth. He infers that many species have kept true for long periods, whereas a few have become modified. The distinction of species he explains by the destruction of intermediate graduated forms. “Thus living plants and animals are not separated from the extinct by new creations, but are to be regarded as their descendants through continued reproduction”.

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[]  C h.  D a r w i n,  ‹T h e  O r i g i n  o f  S p e c i e s›,  J o h n  M u r r a y,  1 8 7 2⁶.
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