It seems likely that at the present time we have acquired from the wilderness nearly all the animals which are capable of adoption by such brief and individual experiments as have won to us the species which constitute our flocks and herds. Our future gains will have to be made by far more deliberate and continuous endeavors. These tasks of the hereafter will have to be undertaken in a way which will insure a continuity of effort such as can only be attained by permanently organized associations which may continue their essays if needs be for centuries. The work should be done with two distinct ends in view: first, to determine what members of the wilderness life may be made to contribute to the needs of man; and, second, how far it is possible so to develop the intelligence of the lower animals in general as to make them better fitted for companionship with our kind. This last-named line of experiments needs to be undertaken not only with reference to varieties now wild, but also upon our most domesticated forms, for, as before remarked, we have not begun to explore the possibilities of intellectual gain, even in those species which have been the longest associated with us. In considering a list of the creatures which might well be made the subjects of trial with a view to their domestication, we find ourselves at once embarrassed by the exceeding wealth of our opportunities. It is impossible within the limits of this article to treat, even in the catalogue way, a vast number of forms which commend themselves for experiment. Something of the richness of the field, however, may be judged by noting some of the more conspicuous forms, as we shall now proceed to do. Beginning with the insects, the lowest forms in the animal series which have proved in any sense domesticable, we note that wide as is this realm of life it offers but few opportunities such as the domesticator seeks. Of the million or more species in the group, only two, the honey-bee and the silkworm, have been won to man's use, and there is not another wild form which the naturalist can suggest as likely to prove a valuable captive. The only use which we are probably to find for these creatures is where, by some form of culture, we may induce predatory or parasitic species more effectively to do their destructive work on noxious forms of the class. So well fitted is this group for purposes of self-defence that however much man may interfere with the course of nature, he is not likely to sweep any of their multitudinous kinds from the earth, though experience clearly shows that by the methods above mentioned they may be greatly reduced.