 In one sense the conditions of life may be said, not only to cause variability, either directly or indirectly, but likewise to include natural selection ; for the conditions determine whether this or that variety shall survive.  The American Journal of Science - Page 671902Full view - About this book
 | Charles Darwin - Evolution - 1866 - 668 pages
...slight, until they become plainly developed and appreciable by us. In a far-fetched sense, however, the conditions of life may be said, not only to cause variability, but likewise to include natural selection ; for it depends on the nature of the conditions whether... | |
 | Charles Darwin - Evolution - 1873 - 492 pages
...surrounding con>| ditions, than on ^tendency to vary, due to causes of which we are quite ignorant. In one sense .the conditions of life may be said,...either directly or indirectly, but likewise to include jatural selection; for the conditions determine whether this or that variety shall survive. But when... | |
 | Charles Darwin - 1875 - 504 pages
...the surrounding conditions, than on a tendency to vary, due to causes of which we are quite ignorant. In one sense the conditions of life may be said, not...determine whether this or that variety shall survive. But when man is the selecting agent, we clearly see that the two elements of change are distinct ;... | |
 | George Henry Lewes - 1877 - 584 pages
...Mr. Darwin has himself, in the following passage, stated a somewhat similar view, and rejected it : "In one sense the conditions of life may be said not only to cause variability, but likewise to include Natural Selection, for the conditions determine whcther this or thai variety... | |
 | Samuel Butler - Evolution - 1879 - 436 pages
...not only to cause variability " (so that here Mr. Darwin appears to support Lamarck's main thesis) " either directly or indirectly, but likewise to include...determine whether this or that variety shall survive." * But later on we find that " the expression of conditions of existence, so often insisted upon by... | |
 | Samuel Butler - Evolution - 1879 - 402 pages
...same thing. For he writes, " in one sense," and it is hard to see any sense but one in what follows, " the conditions of life may be said not only to cause variability " (so that here Mr. Darwin appears to support Lamarck's main thesis) " either directly or indirectly,... | |
 | Joseph Thomas Cunningham - Evolution - 1886 - 48 pages
...the following sentence, Darwin more clearly defines the mode of action of natural selection : — " In one sense the conditions of life may be said not only to cause variability directly or indirectly, but likewise to include natural selection ; for the conditions determine whether... | |
 | George Henry Lewes - First philosophy - 1891 - 584 pages
...and rejected it : " In one sense the conditions of life may be said not only to cause variability, but likewise to include Natural Selection, for the...conditions determine whether this or that variety shall survire. But when man is the selecting agent, we clearly see that the two elements of change are distinct... | |
 | Charles Darwin - Science - 1896 - 408 pages
...the surrounding conditions, than on a tendency to vary, due to causes of which we are quite ignorant. In one sense the conditions of life may be said, not...determine whether this or that variety shall survive. But when man is the selecting agent, we clearly see that the two elements of change are distinct; variability... | |
 | Charles Darwin - Evolution - 1896 - 406 pages
...the surrounding conditions, than on a tendency to vary, due to causes of which we are quite ignorant. In one sense the conditions of life may be said, not...determine whether this or that variety shall survive. But when man is the selecting agent, we clearly see that the two elements of change are distinct; variability... | |
| |
