Size and form have also been modified by domestication, the wild canary being not more than in.
In the case of the latter class, however, acclimatization is a necessary preliminary to naturalization, and in many cases to useful domestication, and we have therefore to inquire whether it is possible.
The chief or only changes which domestication seems to have induced in its appearance are a tendency to albinism generally shown in the plumage of its lower parts, and frequently, though not always, the conversion of the colour of its legs and 1 Columella (De re rustica, viii.
A more curious case is that of the one-humped camel (Camelus dromedarius), a beast only known in domestication, and that in arid countries; yet a number of these have become feral in the Spanish marshes, where they wade about like quadrupedal flamingoes.
One of the greatest of his publications was the Geographical Distribution of Animals (1876), a monumental work, which every student will maintain fully justifies its author's hope that it may bear "a similar relation to the eleventh and twelfth chapters of the Origin of Species as Mr Darwin's Animals and Plants under Domestication bears to the first."
They are, however, all so closely allied that'each will, at least in a state of domestication or captivity, breed with any of the others.
2 3 a shown any aptitude for domestication, and that these should have been from time immemorial the universal and most useful companions and servants of man, while all the others remain in their native freedom to this day.
Finally, in this connexion, the first steps in domestication, beginning with the improvement of natural corrals or spawning ground, and hunting with trained dogs and animals.
With Apis, the genus of the hive-bee, we come to the most highly-specialized members of the family - better known,perhaps, than any other insects, on account of the long domestication of many of the species or races.
Little is positively known of the wild stock to which we owe our tame birds, nor can the period of its reintroduction (for there is apparently no evidence of its domestication being continuous from the time of the Romans) be assigned more than roughly to that of the African discoveries of the Portuguese.
Its patient watchfulness, the fascination it exerted over its victims, the easy domestication of some species, and the deadliness of others have always impressed primitive minds.
It is often confounded with domestication or with naturalization; but these are both very different phenomena.
In a state of nature, every recurring severe winter or otherwise unfavourable season weeds out those individuals of tender constitution or imperfect structure which may have got on very well during favourable years, and it is thus that the adaptation of the species to the climate in which it has to exist is kept up. Under domestication the same thing occurs by what C. Darwin has termed "unconscious selection."
The uniformly reddish or chestnut-brown specimens approach most nearly to the wild mouflon or urial in colour, but the chestnut extends over the whole of the underparts and flanks; domestication having probably led to the elimination of the white belly and dark flank band, which are doubtless protective characters.
The hive bee is, moreover, the only insect known to be capable of domestication, so far as labouring under the direct control of the bee-master is concerned, its habits being admirably adapted for embodying human methods of working for profit in our present-day life.
These white breeds are, however, partial albinos; and such semi-albinos are always the result of domestication and could not have arisen in the wild state.
I and 2; Charles Darwin, Variation of Animals and Plants under Domestication, vols.
And yet in the European Stone age which followed, the age in which the great menhirs and cromlechs were erected, in which the domestication of animals began and the first corn was sown, we find in the strata no image of man or beast, big or little.
In a state of nature canaries pair, but under domestication the male bird has been rendered polygamous, being often put with four or five females; still he is said to show a distinct preference for the female with which he was first mated.