 ... 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...  On the Origin and Metamorphoses of Insects - Page 71by Sir John Lubbock - 1874 - 108 pagesFull view - About this book
 | Sir Norman Lockyer - Electronic journals - 1873 - 742 pages
...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...From this point of view Campodea and the Collembola (Podnra. &c.) are peculiarly interesting. There are among insects three principal types of mouth —... | |
 | Sir Norman Lockyer - Electronic journals - 1872 - 540 pages
...difficulties may be brought under consideration and discussion. "There are," Sir John Lubbock remarks, "peculiar difficulties in those cases in which, as...mandibulate as a larva, and suctorial as an imago." The power of mastication during the first period of life being an advantage, on account of a certain... | |
 | Sir Norman Lockyer - Electronic journals - 1872 - 540 pages
...Sir John Lubbock remarks, "peculiar difficulties in those casrs in which, as among the LepidopUra, the same species is mandibulate as a larva, and suctorial as an imago." The power of mastication during the first period of life being an advantage, on account of a certain... | |
 | Linnean Society of London - Zoology - 1873 - 906 pages
...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...and suctorial as an imago. From this point of view, however, Campodea and the Collembola (Podura, &c.) are peculiarly interesting. There are among insects... | |
 | Linnean Society of London - Zoology - 1873 - 906 pages
...aftects 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...those cases in which, as among the Lepidoptera, the samo species is maudibulatc as a larva and suctorial as an imago. From this point of view, how; ver,... | |
 | Sir John Lubbock - Collembola - 1873 - 436 pages
...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. M. Brauer i believes that among existing types, the genus Ca/inpodea most nearly represents the original... | |
 | Sir John Lubbock - Collembola - 1873 - 452 pages
...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. • M. Brauer1 believes that among existing types, the genus Campodea. most nearly represents the original... | |
 | Charles Darwin - Evolution - 1903 - 544 pages
...obscure phrase may be paraphrased, " the gradational stages being of service to the organism." 4 " There are, however, peculiar difficulties in those...species is mandibulate as a larva and suctorial as an embryo" (Lubbock, "Origin of Insects," p. 423). Letter 244 Cirripedes passing through what I have called... | |
 | Linnean Society of London - Zoology - 1873 - 616 pages
...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...however, peculiar difficulties in those cases in which, ns among the Lepidoptera, the same species is maudibulate as a larva and suctorial as an imago. From... | |
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