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Through a small jump we come here to a remarkableanalogy, a parallel analogy, already described by us. As already mentioned,variable environment inorganic body forms after a certain periodtime the outer layer has already been subjected to that change which canproduce of the surrounding agents; the mass contained within, remainunchanged, because it is not available external agents; betweenthese two elements there is an area of ongoing impactthe surface where the change goes ahead. And we saw that similarly, inplant and animal cells have similar arrangement of parts,of course with the difference that the internal part of these cells remainssupine. Now we need to show that in those aggregates of cells,which constitute the Metaphyta and Metazoa, there is also the samethe distribution of parts. Of course, the plants we have no right to look for them nothe leaves or other parts is eliminated, and only those that havelong existence in the trunks and branches. Naturallywe have nothing to expect that plants with this method of growth, whichpreviously, produces the outer dead part, completely protecting the internalactively living part of the trunk from the influence of environment, are long-livedagrogene as wood ferns, and long living endogeny as palm trees.
In the first Chapter of "Origin of species", referring tothe inherited effects of habit, he says that "animals have increasedthe use or disuse of parts has a very considerable influence";as an example, he said to change the relative weightparts of the wings and legs in wild ducks compared to homemade duck - on"strong inherited development of the udders in cows and goats" and the drooping earsPets. Here is some places from the last edition of hiswork: "I think that there can be no doubt that ourpet use increased and increased some parts of the body, anddisuse has reduced the others, and that such changes were passed oninheritance." (On the following pages, Darwin gives further examplesthis kind of change.) "Habit - in relation to the emergence ofconstitutional features, the use - in relation to strengtheningorgans and disuse - in relation to the reduction of the bodies are inmany cases, powerful figures in their consequences. Discussingspecial cases, Mr. Mivart passes by the consequences of increaseduse and disuse of body parts, which I had always attached highvalue and over than I have in my "Variation under Domestication" stayedmuch longer than I should have thought any other of the writers." "On the onehand, the disuse may explain the poor development of the entire backbody, including side fins." "I can give you another examplethe structure, which is, obviously, its appearance is obliged onlyaddicting and habit." "Apparently, it is probable that the disuse ofwas a powerful figure in the production of fundamental bodies.""In General, we may conclude that habit, use anddisuse in some cases, played a very significant role inthe process of amending the Constitution and structure; but recent changes oftenlargely combined with, and sometimes d
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