All races of men are capable of progress in civilization. Many, indeed, remain in a savage state for thousands of years, and we cannot positively prove that any particular race which has always been uncivilized is capable of civilization. But we are led to believe it from having known of so many tribes of men who have emerged from apathy, ignorance, and barbarism into the light of science and art. So it was with all the Teutonic races,—the Goths, Germans, Kelts, Lombards, Scandinavians. So it was with the Arabs, who roamed for thousands of years over the deserts, a race of ignorant robbers, and then, filled with the great inspiration of Islam, flamed up into a brilliant coruscation of science, literature, art, military success, and profound learning. What great civilizations have grown up in China, India, Persia, Assyria, Babylon, Phœnicia, Egypt, Greece, Rome, Carthage, Etruria! But no such progress has ever appeared among the animals. As their parents were, five thousand years ago, so, essentially, are they now.

Nor are animals religious, in the sense of worshiping unseen powers higher than themselves. My horse showed a sense of the supernatural, but this is not worship.

These are some of the most marked points of difference between man and all other animals. Now these can all be accounted for by the hypothesis in which Locke and Leibnitz both agreed; namely, that while animals are capable of reasoning about facts, they are incapable of abstract ideas. Or, we may say with Coleridge, that while animals, in common with man, possess the faculty of understanding, they do not possess that of reason. Coleridge seems to have intended by this exactly what Locke and Leibnitz meant by their statement. When my dog Don heard the word "apple," he thought of the particular concrete apple under the tree; and not of apples in general, and their relation to pears, peaches, etc. Don understood me when I told him to go and get an apple, and obeyed; but he would not have understood me if I had remarked to him that apples were better than pears, more wholesome than peaches, not so handsome as grapes. I should then have gone into the region of abstract and general ideas.

Now it is precisely the possession of this power of abstract thought which will explain the superiority of man to all other animals. It explains the use of tools; for a tool is an instrument prepared, not for one special purpose, but to be used generally, in certain ways. A baboon, like a man, might pick up a particular stone with which to crack a particular nut; but the ape does not make and keep a stone hammer, to be used on many similar occasions. A box of tools contains a collection of saws, planes, draw-knives, etc., not made to use on one occasion merely, but made for sawing, cutting, and planing purposes generally.

Still more evident is it that the power of abstraction is necessary for verbal language. We do not here use the common term "articulate speech," for we can conceive of animals articulating their vocal sounds. But "a word" is an abstraction. The notion is lifted out of the concrete particular fact, and deposited in the abstract general term. All words, except proper names, are abstract; and to possess and use a verbal language is impossible, without the possession of this mental faculty.

In regard to self-culture, it is clear that for any steady progress one must keep before his mind an abstract idea of what he wishes to do. This enables him to rise above impulse, passion, instinct, habit, circumstance. By the steady contemplation of the proposed aim, one can arrange circumstances, restrain impulse, direct one's activity, and become really free.

In like manner, races become developed in civilization by the impact of abstract ideas. Sometimes it is by coming in contact with other civilized nations, which gives them an ideal superior to anything before known. Sometimes the motive power of their progress is the reception of truths of science, art, literature, or religion.

It is not necessary to show that without abstract, universal, and necessary ideas no religion is possible; for religion, being the worship of unseen powers, conceived as existing, as active, as spiritual, necessarily implies these ideas in the mind of the worshiper.

We find, then, in the soul of animals all active, affectionate, and intelligent capacities, as in that of man. The only difference is that man is capable of abstract ideas, which give him a larger liberty of action, which enable him to adopt an aim and pursue it, and which change his affections from an instinctive attachment into a principle of generous love. Add, then, to the animal soul the capacity for abstract ideas, and it would rise at once to the level of man. Meantime, in a large part of their nature, they have the same faculties with ourselves. They share our emotions, and we theirs. They are made "a little lower" than man, and if we are souls, so surely are they.

Are they immortal? To discuss this question would require more space than we can here give to it. For my own part, I fully believe in the continued existence of all souls, at the same time assuming their continued advance. The law of life is progress; and one of the best features in the somewhat unspiritual theory of Darwin is its profound faith in perpetual improvement. This theory is the most startling optimism that has ever been taught, for it makes perpetual progress to be the law of the whole universe.