On the Origin and Metamorphoses of Insects

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Macmillan and Company, 1874 - Entomology - 108 pages

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Page 109 - Columns, forming a medium of Scientific discussion and of intercommunication among the most distinguished men of Science...
Page 64 - Each organism exhibits, within a short space of time, a series of changes which, when supposed to occupy a period indefinitely great, and to go on in various ways instead of one way, give us a tolerably clear conception of organic evolution in general.
Page 43 - ... of the Carabi and Petalocera ; the thorax is next defined, and the parts or appendages of the head are formed, at which stage of development the young orthopteran corresponds with the hexapod antenniferous larva of the Meloe ; but it differs from all coleopterous...
Page 109 - AN ILLUSTRATED JOURNAL OF SCIENCE. NATURE expounds in a popular and yet authentic manner, the GRAND RESULTS OF SCIENTIFIC RESEARCH, discussing the most recent scientific discoveries, and pointing out the bearing of Science upon civilisation and progress, and its claims to a more general recognition, as well as to a higher place in the educational system of the country. It contains original articles on all subjects within the domain of Science ; Reviews setting forth the nature and value of recent...
Page 73 - ... could the mouth of the Hemiptera be modified into a mandibulate type like that of the Coleoptera. But in Campodea and the Collembola we have a type of animal closely resembling certain larv...
Page 31 - Fabre ascertained this, not only by examining the burrow of the anthophoras, but also by direct observations of some young larvae kept in captivity. In April, however, his captives at last awoke from their long lethargy, and hurried anxiously about their prisons. Naturally inferring that they were in search of food, M. Fabre supposed that this would consist either of the larvae or pupae of the anthophora, or of the honey with which it stores its cell.
Page 40 - When an animal is hatched from the egg in an immature form, the external forces acting upon it are different from those which affect the mature form, and thus changes are produced in the young, bearing reference to its present wants rather than to its ultimate form. 7. When the external organs arrive at this final form before the organs of reproduction are matured, these changes are known as metamorphoses ; when, on the contrary, the organs of reproduction are functionally perfect before...
Page 74 - This, however, is a rare case ; and it is possible that the principal use of the wings was, primordially, to enable the mature forms to pass from pond to pond, thus securing fresh habitats and perhaps avoiding in-and-in breeding. If so, the development of wings would tend to be relegated to a late period of life ; and by the tendency to the inheritance of characters at corresponding ages, to which Mr.
Page 71 - ... slightly, it immediately becomes subject to the action of distinct forces : natural selection affects it in two different and, it may be, very distinct manners, gradually leading to differences which may become so great as to involve an intermediate period of change and quiescence. There are, however, peculiar difficulties in those cases in which, as among the Lepidoptera, the same species is mandibulate as a larva and suctorial as an imago.

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