. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Fiff. 5. In these cases, and especially where we have to do witli about ten raetameres, the explanation of the origin of these articulated forms which I have just given cannot suffice; and hence it must be supplemented by a very in- teresting law, which Prof. N. Wagner of St. Peters- burg has denominated tlie law of ijliysiological inertia^ and has so happily applied to the explanation of the incredible number of metameres (articulations) with which various worms (Annelida) ar
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Fiff. 5. In these cases, and especially where we have to do witli about ten raetameres, the explanation of the origin of these articulated forms which I have just given cannot suffice; and hence it must be supplemented by a very in- teresting law, which Prof. N. Wagner of St. Peters- burg has denominated tlie law of ijliysiological inertia^ and has so happily applied to the explanation of the incredible number of metameres (articulations) with which various worms (Annelida) are furnished. According to this law, some cause having origi- nated two or three metameres, the appearance of the following raetameres may be brought about without the further aid of the primary cause, but solely under tlie influence of a tendency that the organism has to repeat the process of the appearance of metameres (a process at first induced by some external influence \choque\^ such as abun- dance of food) by inertia^ as it were, until finally resistance, under different forms, may put a stop to it. The difi^erent qualities and properties of an organism are often retained, by force of heredity, without interruption and without modification during a long series of generations, even when the cause which has induced these qualities has long disappeared. It is so in the case in question : a certain. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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