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I do not think; and if Mr. Ben spent the next thought with which he began, hehe probably would have seen that this is impossible. As already mentioned, he openlyadopts "the natural-historical method", as it not only refers tohim in the Preface, but it leads in the first Chapter examples of Botanical andZoological classifications as the explanation of the manner in which heproposes to develop mental excitement. We recognize this philosophicalvision and only regret that Mr. Bain has overlooked some of herthe most important conclusions. In fact, what was the essence of progressnatural history classification? The abandonment of the habit groupitems external, outstanding characters and in making, by the base groups,some internal and most significant features. Whales nowtime is not added more to the fish merely on the ground thatforms and manners of life they resemble fish; now they are referred tomammals, because the type of organization, how it is foundanatomical studies, corresponds to the type of mammals. Polyzoa, onfirst, because of their shape and method of growth, were viewed askelp, now, the study of their internal structure and activitiesbe belonging to the animal Kingdom. So, obviously, the openingreal affinity involves the analysis. Now they found that the formerclassification rukovodilac General similarity, though, is a lottrue and were useful for a time, were in many cases radicallyfalse and that the true affinities of the organisms present and their compliance withparts can be opened only by the study of the internal structure.We also note another very important fact in the history of the classification. Veryoften even a thorough analysis is unable to detect the affinity of organismsif this analysis is limited to the structure of organisms only in Matureage. In many cases, it is necessary to investigate the structure of the body on itearly stages and even in his infancy. For example, to determine the present position of the cirripeds between animals, exploring onlyMature individuals, it was before difficult, that Cuvier erroneously considered them toshellfish even after their anatomy; and not before, as you open themthe earliest forms, it was found that they belong to the crustaceans. In fact,a study of the development, as a means of classification, so it is important that advancedzoologists of our time think it is the only absolute criterion.
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