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In cases where large ulcer has consumed the deep layer, which engendersthe epidermis, or where this layer is destroyed a significant burn, processeshealing present many instructive. From underlying tissues thatunder normal conditions, do not participate in the outer growth occursnew leather or should I say, replacing the skin layer, because it does not containno hair follicles or other accessories of this layer of the skin.However, this layer is so similar to a real epidermis, whichas it is constantly renewed defensive cover.Of course, it can be argued that this method of origin of the skin is the resultthe inherited tendencies to the desire to restore damagedstructure of a certain character. Nevertheless, we cannot fail to recognizedirect influence of environment, referring to the above facts orremembering another fact that the burned surface of the skin, not protected fromof air action and secretes the shell of a collapsible lymph. But we cancite other evidence that directly effect the environmentis the main factor. An accident or illness cause sometimes fallingof the mucous membrane. After the state of rastajimosti firstsubstantial but gradually decreasing as the onset of change, thisthe shell adopts the General character of ordinary skin. But that's not all,changes its microscopic structure. Where the mucous membranethis species is covered with cylindrical epithelium, the cylinders graduallydecrease, becoming completely flat, so that a flakethe epithelium, i.e., a structure very close to the structure of the epidermis. Here alreadyyou cannot refer to the desire to fill the broken type, because here,on the contrary, we are dealing with a deviation from the type. Effect of environment sogreat that in a short time it osilivaet inherited tendency andcauses structure, the opposite of normal.
In their subsidiary work "The Variation of Animals and Plantsunder Domestication", where Darwin considers the issue in detail, he givesmore extensive evidence of inherited effects of use anddisuse. Give some of these places, taken from the first volumefirst edition. Speaking of pet rabbits, Darwin writes: "a Lack of exerciseobviously, changed the length of the legs relative to the body..." "Thus, we seewhat is the most important and complex organ (the brain) throughout your organizationsubject to the law of decrease in mass from disuse". Darwin noticesthat the birds of oceanic Islands that are not pulled persecutionthe enemies, the reduction of the wings has occurred, in all probability, fromgradual disuse. Comparing one of these birds - coots withTristan da Cunha with the relevant European bird and showingthat all the bones involved in flight, at first is less than, Darwin adds:"Thus, in the skeleton of this natural species nearly meet suchsame modifications, except went a little further, like homeducks; and in the latter case, I think no one will dispute thatsuch changes have occurred from the reduction in the use of the wings and reinforceduse your legs... Like other Pets, very tamefor a long time, just like that of silkworms suffered some instinct;the caterpillars, when placed on a mulberry tree, sometimes becoming strangethe disadvantage to devour the base of the sheet on which they are located, and through theto fall down; but according to Robin (Robmet), they retain the ability againto climb the tree. But sometimes this ability is lost; and then fellcaterpillar, not being able to get up, die of starvation; often they are notable to move from leaf to leaf".
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