mechanical knowledge. An illustration of this is the account of the nest of a pair of orioles, as described in the "North American Review" for May, 1903, by a writer of popular nature books. These orioles built a nest so extraordinary that it can be accounted for only on the theory that there is a school of the woods, and that these two birds had been pupils there and had taken an advanced course in Strings. Among other things impossible for birds to do, these orioles tied a knot in the end of a string to prevent its fraying in the wind! If the whole idea were not too preposterous for even a half-witted child to believe, one might ask, What in the name of anything and everything but the "Modern School of Nature Study" do orioles know about strings fraying in the wind and the use of knots to prevent it? They have never had occasion to know; they have had no experience with strings that hang loose and unravel in the wind. They often use strings, to be sure, in building their nests, but they use them in a sort of haphazard way, weaving them awkwardly into the structure, and leaving no loose ends that would suffer by fraying in the wind. Sometimes they use strings in attaching the nest to the limb, but they never knot or tie them; they simply wind them round and round as a child might. It is possible that a bird might be taught to tie a knot with its foot and beak, though I should have to see it done to be convinced. But the orioles in question not only tied knots; they tied them with a "reversed double hitch, the kind that a man uses in cinching his saddle"! More wonderful still, not finding in a New England elm-embowered town a suitable branch from which to suspend their nest, the birds went down upon the ground and tied three twigs together in the form of "a perfectly measured triangle" (no doubt working from a plan drawn to a scale). They attached to the three sides of this framework four strings of equal length (eight or ten inches), all carefully doubled, tied them to a heavier string, carried the whole ingenious contrivance to a tree, and tied it fast to a limb in precisely the way you or I would have done it! From this framework they suspended their nest, the whole structure being about two feet long, and having the effect of a small hanging basket. Still more astonishing, when the genuineness of the nest is questioned, a man is found who makes affidavit that he saw the orioles build it! After such a proceeding, how long will it be before the water-birds are building little rush cradles for their young, or rush boats to be driven about the ponds and lakes by means of leaf sails, or before Jenny Wren will be living in a log cabin of her own construction? How long will it be before some one makes affidavit that the sparrow with his bow and arrow has actually been seen to kill Cock Robin, and the beetle with his thread and needle engaged in making the shroud? Birds show the taste and skill of their kind in building their nests, but rarely any individual ingenuity and inventiveness. The nest referred to is on a plane entirely outside of Nature and her processes. It belongs to a different order of things, the order of mechanical contrivances, and was of course "made up," probably from a real oriole's nest, and the writer who vouches for its genuineness has been the victim of a clever practical joke – a willing victim, no doubt, since he is looking in Nature for just this kind of thing, and since he believes there is "absolutely no limit to the variety and adaptiveness of Nature even in a single species." If there is no such limit, then I suppose we need not be surprised to meet a winged horse, or a centaur, or a mermaid at any time.

      It is as plain as anything can be that the animals share our emotional nature in vastly greater measure than they do our intellectual or our moral nature; and because they do this, because they show fear, love, joy, anger, sympathy, jealousy, because they suffer and are glad, because they form friendships and local attachments and have the home and paternal instincts, in short, because their lives run parallel to our own in so many particulars, we come, if we are not careful, to ascribe to them the whole human psychology. But it is equally plain that of what we mean by mind, intellect, they show only a trace now and then. They do not accumulate a store of knowledge any more than they do a store of riches. A store of knowledge is impossible without language. Man began to emerge from the lower orders when he invented a language of some sort. As the language of animals is little more than various cries expressive of pleasure or pain, or fear or suspicion, they do not think in any proper sense, because they have no terms in which to think – no language. I shall have more to say upon this point in another chapter. One trait they do show which is the first step toward knowledge – curiosity. Nearly all the animals show at times varying degrees of curiosity, but here again an instinctive feeling of possible danger probably lies back of it. They even seem to show at times a kind of altruistic feeling. A correspondent writes me that she possessed a canary which lived to so great an age that it finally became so feeble it could not crack the seeds she gave it, when the other birds, its own progeny, it is true, fed it; and Darwin cites cases of blind birds, in a state of nature, being fed by their fellows. Probably it would be hasty to conclude that such acts show anything more than instinct. I should be slow to ascribe to the animals any notion of the uses of punishment as we practice it, though the cat will box her kittens when they play too long with her tail, and the mother hen will separate her chickens when they get into a fight, and sometimes peck one or both of them on the head, as much as to say, "There, don't you do that again." The rooster will in the same way separate two hens when they are fighting. On the surface this seems like a very human act, but can we say that it is punishment or discipline in the human sense, as having for its aim a betterment of the manners of the kittens or of the chickens? The cat aims to get rid of an annoyance, and the rooster and the mother hen interfere to prevent an injury to members of their family; they exhibit the paternal and maternal instinct of protection. More than that would imply ethical considerations, of which the lower animals are not capable. The act of the baboon, mentioned by Darwin, I believe, that examined the paws of the cat that had scratched it, and then deliberately bit off the nails, belongs to a different and to a higher order of conduct.