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" The intermixture of distinct species is guarded against by the aversion of the individuals composing them to sexual union, or by the sterility of the mule offspring. It does not appear that true hybrid races have ever been perpetuated for several generations,... "
Creation's Testimony to Its God, Or The Accordance of Science, Philosophy ... - Página 163
por Thomas Ragg - 1858
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Principles of Geology: Being an Attempt to Explain the Former ..., Volumen2

Sir Charles Lyell - 1832 - 368 páginas
...least possible excess beyond the defined limits being fatal to the existence of the individual. Sthly. The intermixture of distinct species is guarded against...of man ; for the cases usually cited relate to the crossing of mules with individuals of pure species, and not to the intermixture of hybrid with hybrid....
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Principles of Geology: Being an Attempt to Explain the Former ..., Volumen2

Charles Lyell - 1833 - 366 páginas
...deviation can be obtained by continuing to alter the circumstances, though ever so gradually,—indefinite divergence, either in the way of improvement or deterioration,...of man; for the cases usually cited relate to the crossing of mules with individuals of pure species, and not to the intermixture of hybrid with hybrid....
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Principles of Geology: Being an Inquiry how for the Former Changes ..., Volumen2

Sir Charles Lyell - 1835 - 472 páginas
...may usually be effected in a brief period of time, after which no farther deviation can be obtained by continuing to alter the circumstances, though ever...of man ; for the cases usually cited relate to the crossing of mules with individuals of pure species, and not to the intermixture of hybrid with hybrid....
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Lectures on the Atheistic Controversy: Delivered in the Months of February ...

Benjamin Godwin - 1834 - 314 páginas
...possible excess beyond the defined limits being fatal to the existence of the individual. " oth ly, The intermixture of distinct species is guarded against...of man ; for the cases usually cited relate to the crossing of mules with individuals of pure species, and not to the intermixture of hybrid with hybrid....
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Principles of geology, Volumen3

sir Charles Lyell (bart.) - 1835 - 500 páginas
...may usually be effected in a brief period of time, after which no farther deviation can be obtained by continuing to alter the circumstances, though ever...of man; for the cases usually cited relate to the crossing of mules with individuals of pure species, and not to the intermixture of hybrid with hybrid....
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Lectures on the Atheistic Controversy: Delivered in the Months of February ...

Benjamin Godwin - 1835 - 384 páginas
...may usually be effected in a brief period of time, after which no further deviation can be obtained by continuing to alter the circumstances, though ever...of man ; for the cases usually cited relate to the crossing of mules with individuals of pure species, and not to the intermixure of hybrid with hybrid....
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Principles of Geology: Being an Inquiry how Far the Former Changes ..., Volumen1

Sir Charles Lyell - 1837 - 568 páginas
...least possible excess beyond the defined limits being fatal lo the existence of the individual. Sthly. The intermixture of distinct species is guarded against...perpetuated for several generations, even by the assistance * E. R- A. Serres, Anatomic Compare du Cerveau, illustrated by numerous plates, tome i., 1824. of man...
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Principles of geology, Volumen3

sir Charles Lyell (bart.) - 1840 - 504 páginas
...effected in a brief period of time, after which no farther deviation can be obtained by conr tinuing to alter the circumstances, though ever so gradually...of man; for the cases usually cited relate to the crossing of mules with individuals of pure species, and not to the intermixture of hybrid with hybrid....
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The Eclectic Magazine of Foreign Literature, Science, and Art, Volumen19

1850 - 600 páginas
...and the least excess beyond the defined limits being fatal to the existence of the individual. " 5th. The intermixture of distinct species is guarded against...of man ; for the cases usually cited relate to the crossing of mules with individuals of the pure species, and not to the intermixture of hybrid with...
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The Quarterly Review, Volumen86

William Gifford, Sir John Taylor Coleridge, John Gibson Lockhart, Whitwell Elwin, William Macpherson, William Smith, Sir John Murray IV, Rowland Edmund Prothero (Baron Ernle) - 1850 - 612 páginas
...and the least excess beyond the defined limits being fatal to the existence of the individual. ' 5th. The intermixture of distinct species is guarded against...of man ; for the cases usually cited relate to the crossing of mules with individuals of the pure species, and not to the intermixture of hybrid with...
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