At the present time in Europe, Asia, and America there are probably not far from ten million people who depend in large measure upon the product of the silkworm for their livelihood. Although the product of their industry and that of the insects combined is not nearly as indispensable to man as those which are won from the hair of animals or the fibres of plants--for silk is a luxury rather than a necessity--the value of the work done by these humble creatures is greater than that effected by the largest of our domesticated animals, the elephant. If the philanthropic economist were forced to choose which of these creatures should pass from the earth, he would have to accept the loss of the greater and far nobler animal. So far as regards their intelligence, the silkworms are much below the level of the bees. Though they dwell in an aggregate way they have scarcely a semblance of social order, and are without the wide range of peculiar instincts which we invariably find among the commonwealth animals. The order of _Lepidoptera_, in which these creatures belong, though the most beautiful, appears to be from an intellectual point of view the least advanced of our insects. Their instincts are all on a low plane; they have no kind of mutual labor, and however much advance we may make by selection in developing their bodies, there is no reason to expect that we shall affect their intelligences. The cochineal insect, a species which has the habit of feeding upon the cactus, is used for a dye stuff, for which service the brightly colored body is appropriated. Although the creature is deliberately planted where it is to feed, and thus is in a way submitted to culture, it cannot fairly be said to have been entered in the domesticated circle of man. In a similar way the so-called Spanish fly--which really belongs among the beetles--whose ground-up bodies are used for producing blisters, is merely appropriated to our use without any process of subjugation. The fact remains that, so far as our dealings with the insect world have gone, we have really won but two of the million or more of forms to captivity; and our relations with these have nothing of the humanized nature which marks our intercourse with truly domesticated creatures.