 | 1866 - 808 páginas
...effect on the insects must have been still greater, for six insectivorous birds were very common in the plantations which were not to be seen on the heath...whatever else having been done, with the exception that the land had been enclosed, so that cattle could not enter. But how important an element enclosure... | |
 | Charles Darwin - 1861 - 470 páginas
...effect on the insects must have been still greater, for six insectivorous birds were very common in the plantations, which were not to be seen on the heath...whatever else having been done, with the exception that the land had been enclosed, so that cattle could not enter. But how important an element enclosure... | |
 | Charles Darwin - 1864 - 472 páginas
...effect on the insects must have been still greater, for six insectivorous birds were very common in the plantations, which were not to be seen on the heath...whatever else having been done, with the exception that the land had been enclosed, so that cattle could not enter. But how important an element enclosure... | |
 | Charles Darwin - 1873 - 492 páginas
...on the insects must have been • still greater, for six insectivorous birds were very common in the plantations, which were not to be seen on the heath ; and the heatli was frequented by two or three distinct insectivorous birds. Here we see how potent has been^he... | |
 | Charles Darwin - 1875 - 504 páginas
...still greater, for six insectivorous birds were very common in the plantations, which were not to bo seen on the heath ; and the heath was frequented by...the introduction of a single tree, nothing whatever elue having been done, with the exception of the kind having been enclosed, so that cattle could not... | |
 | Charles Darwin - 1882 - 492 páginas
...effect on tlie insects must have been still greater, for six insectivorous birds were very common in the plantations, which were not to be seen on the heath...that cattle could not enter. But how important an clement enclosure is, I plainly saw near Farnham, in Surrey. Here there are extensive heaths, with... | |
 | Charles Darwin - 1883 - 494 páginas
...effect on the insects must have been still greater, for six insectivorous birds were very common in the plantations, which were not to be seen on the heath...the introduction of a single tree, nothing whatever elue having been done, with the exception of the land having been enclosed, so that cattle could not... | |
 | Charles Darwin - 1884 - 494 páginas
...Here we see how potent has been the effect of the introduction of a single tree, nothing whatever eloe having been done, with the exception of the land having been enclosed, so th:it cattle could not enter. But how important an element enclosure is, I plainly saw near Farnham,... | |
 | Henry William Crosskey - 1889 - 140 páginas
...effect on the insects must have been still greater, for six insectivorous birds were very common in the plantations which were not to be seen on the heath;...having been enclosed, so that cattle could not enter."* A thousand other illustrations of man's power over nature could be given; and it is scarcely too much... | |
 | Charles Dudley Warner - 1897 - 494 páginas
...effect on the insects must have been still greater, for six insectivorous birds were very common in the plantations which were not to be seen on the heath;...been done, with the exception of the land having been inclosed so that cattle could not enter. But how important an element inclosure is, I plainly saw near... | |
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... plantations, which were not to be seen on the heath ; and the heath was frequented by two or three distinct insectivorous birds. Here we see how potent has been the effect of the introduction of a single tree... 
