| → habit and selection have probably 1869 |
| probably, habit and selection have 1859 1860 1861 1866 |
| habit and selection have 1872 |
|
| → three, out of those which I shall have to discuss in my future work,— 1869 |
| three, out of the several which I shall have to discuss in my future work,— 1859 1860 1861 1866 |
| three,— 1872 |
|
| →
Cuckoo
.
—
1869 |
|
Cuckoo.
—
1866 |
|
Cuckoo
—
1872 |
|
| → supposed by some naturalists 1869 1872 |
| now commonly admitted 1859 1860 1861 1866 |
|
| → instinct of the cuckoo 1869 1872 |
| cuckoo's instinct 1859 1861 |
| cuckoos instinct 1860 |
| most remarkable of the instincts of the cuckoo 1866 |
|
|
danger-chuckle, they will run (more especially young turkeys) from under her, and conceal themselves in the surrounding grass or thickets; and this is evidently done for the instinctive purpose of allowing, as we see in wild ground-birds, their mother to fly away. But this instinct retained by our chickens has become useless under
for the mother-hen has almost lost by disuse the power of flight. |
|
| Hence, we may conclude, that
instincts have been
and natural instincts have been
partly by habit, and partly by man selecting and
during successive generations, peculiar mental habits and actions, which at first appeared from what we must in our ignorance call an accident. In some cases compulsory habit alone has sufficed to produce
mental changes; in other cases compulsory habit has done nothing, and all has been the result of selection, pursued both methodically and
but in most
→habit and selection have probably
|
| Special
|
| We shall, perhaps, best understand how instincts in a state of nature have become modified by selection, by considering a few cases. I will select only
→three, out of those which I shall have to discuss in my future work,—
namely, the instinct which leads the cuckoo to lay her eggs in other
nests; the slave-making instinct of certain ants; and the
power of the
two latter instincts have
and
been ranked by naturalists as the most wonderful of all known instincts. |
|
→
Cuckoo
.
—
|
| It is
→supposed by some naturalists
that the more immediate
cause of the
→instinct of the cuckoo
is, that she lays her eggs, not daily, but at
|
