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Moreover, the mostimportant features can be at the same time and mosthidden; is already in the vegetable Kingdom it can be noted that notflowers and not the fruit, the most visible part of the plant,here are the most important elements, but the embryonicapparatus and organs such as the cotyledons. In animals this phenomenonis even more common. Storr believed that large classes ofthe animals should be determined by forms of circulation,and Lamarck (which, however, he was not engaged in autopsies)rejected even for lower animals the principle of classification,based only on visible form: "Reviewbody and members of the crustaceans made allscientists to see them as real insects; Ihe long adhered to the common opinion on this matter. Howeversince it is known that an organic structure more importantjust how to classify animals according to the method andthe nature, and to identify the true relationship betweenanimals, it follows that the crustaceans, which,like shellfish, breathe exclusively with gills and also havemuscle heart, should be placed directly behindshellfish to arachnids and insects, whichorganized differently"<$FLemarck. Systeme des animaux sansvertebtes, Paris, 1801, p. 143--144.>.
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