While all the creatures of the wilderness may by the breeder's art be induced to vary in the conditions of captivity, the birds have shown themselves more plastic in our hands than any other animals. In almost every brood we find individuals possessing marked peculiarities of form or plumage. In their mental qualities also there is a like range of variation. Seizing upon these, the fancier can guide the quick succeeding generations so as to cause the form to depart in the course of a few years very far from its original aspect. With each step in this succession of changes the readiness with which the species responds to selective care increases. The results which have been attained in our barnyard fowl and with the pigeons show how admirably these creatures are fitted to obey the will of man when he has a mind to take charge of their destiny. Perhaps the greatest conquests which we have yet to make among the birds will be won from the species which have the habit of dwelling mainly or altogether upon the ground. These, as experience shows, can be more readily brought to the uses of man than the species which are free by their strong wings to wander through the realms of air. There are very many of these ground birds the domestication of which has never been fairly essayed. There are perhaps a hundred species which in one part of the world or another might afford valuable additions to our resources, those of ornament or of economy, and yet within three centuries only one of these, the turkey, has been brought to the domesticated state. The greater part of our game birds, such as the quail, pheasants, and partridges, though they appear on slight experiments to be untamable, could probably by continuous effort be reduced to perfect domestication. For ages they have been harried by man in a manner which has insured a great fear of his presence. We have indeed through our hunting instituted a very thorough-going and continuous system of selection which has tended to affirm in these creatures an intense fear of our kind. Only the more timorous have escaped us, and year after year we proceed to remove with the gun the individuals which by chance are born with any considerable share of the primitive tolerance of man's presence. It is not to be expected that the chicks of these species will at once accept relations with our kind. The domestication of many of these forms is to be desired, not only on account of the excellent quality of their flesh, but because of their beauty and the charm which their quick intelligences afford them. Whoever has watched them in their care of their young or their other social habits has observed features which indicate a possible development under domestication perhaps greater than that which we have attained in any other of our feathered captives.