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Similarly, it is possible to explain the origin of the azygos ballooningbag the seal of hohloch (Cistofora cristata), a curious fishingthe device in the form Carovigno appendage on the head of the Lophius piscatoriusor monkfish, spurs on the wings of certain birds, the weapons of the sword-fish orthe saw-fish earrings in poultry and many other similar featureswhich cannot be explained by the effect of use or disuse, butwhich is explainable as the result of natural selection acting in the factdirection or the other. Secondly, Darwin, showing us howarose innumerable modifications of form, structure and colouring, at the same timehas shown how by maintaining a favorable modifications couldbe new education. For example, the first step in the developmenthorns on the heads of various herbivorous animals could be acalloused growths caused by the habit of butting; such growths,originating functionally, could then evolve due to selection, inthe most favorable direction. This explanation cannot be applied tothe unexpected appearance of the second pair of horns, which often happens atsheep: such an appendage, if he was virtuous, would bea permanent sign due to natural selection. Similarly, changesthe number of vertebrae cannot be explained by the influence of the use of ordisuse; but if we admit the possibility of spontaneous orcorrect, random variation, we understand that if the extensionthe vertebra (as in some pigeons) would have been a favorable modification,that experience better fit could turn into permanentfeature. In the future, such an increase of the vertebrae could occurthese long strips of vertebrae, what we see, for example, of the snakes. Absolutelythe same can be said about Breasts. There is nothing unreasonable inthe assumption that due to the greater or less consumption,transmitted by inheritance in the successive generations, dairycancer could grow or shrink in size. But may not beand question, do does that explanation to the change in the number of mammary glands.
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