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Text in this page (from paragraph 4200, sentence 510, word 1 to paragraph 4200, sentence 510, word 39) is not present in 1859
In all these cases of two very distinct species furnished with apparently the same anomalous organ, it should be observed that, although the general appearance and function of the organ may be the same, yet some fundamental difference can generally be detected. I am inclined to believe that in nearly the same way as two men have sometimes independently hit on the very same invention, so natural selection, working for the good of each being and taking advantage of analogous variations, has sometimes modified in very nearly the same manner two parts in two organic beings, which owe but little of their structure in common to inheritance from the same ancestor.
Text in this page (from paragraph 4200, sentence 710 to paragraph 4210, sentence 300, word 32) is not present in 1859
The luminous organs which occur only in a few insects, belonging to widely different families and orders, but which are situated in different parts of their bodies, offer a difficulty almost exactly parallel with that of the electric organs. Other cases could be given; for instance in plants, the very curious contrivance of a mass of pollen-grains, borne on a foot-stalk with an adhesive gland, is apparently the same in Orchis and Asclepias,—genera almost as remote as is possible amongst flowering plants. In all these cases of two species, far removed from each other in the scale of organisation, being furnished with a similar anomalous organ, it should be observed that although the general appearance and function of the organ may be identically the same, yet some fundamental difference between them can always, or almost always, be detected. I am inclined to believe that, in the same manner as two men have sometimes independently hit on the same invention, so natural selection, working for the good of each being and taking advantage of analogous variations, has sometimes modified in nearly the same way two organs in two organic beings, which owe but little of their structure in common to inheritance from the same ancestor.
Fritz Müller, in a remarkable work recently published, has discussed a case nearly parallel with that of electric fishes, luminous insects, &c.; he undertook the laborious examination of this case in order to test the views advanced by me in this volume. Several families of crustaceans include a few members which are fitted to live out of the water and possess an air-breathing apparatus. In two of these families, which were more especially examined by Müller, and which are nearly related to each other, the species agree most closely in all important characters: namely in the structure of