It is certain that however we may conceive of the wonderful little bricks of which the world is builded, we must suppose a similarity and fitting and identity in their frame. It is necessary to suppose that every hose in nature fits every hydrant; so only is combination, chemistry, vegetation, animation, intellection possible. Without identity at base, chaos must be forever. And as mind, our mind or mind like ours reappears to us in our study of nature, nature being everywhere formed after a method which we can well understand, and all the parts, to the most remote, allied or explicable,—therefore our own organization is a perpetual key, and a well-ordered mind brings to the study of every new fact or class of facts a certain divination of that which it shall find. This reduction to a few laws, to one law, is not a choice of the individual, it is the tyrannical instinct of the mind. There is no solitary flower and no solitary thought. It comes single like a foreign traveller,—but find out its name and it is related to a powerful and numerous family. Wonderful is their working and relation each to each. We hold them as lanterns to light each other and our present design. Every new thought modifies, interprets old problems. The retrospective value of each new thought is immense, like a torch applied to a long train of gunpowder. To be isolated is to be sick, and in so far, dead. The life of the All must stream through us to make the man and the moment great. Well, having accepted this law of identity pervading the universe, we next perceive that whilst every creature represents and obeys it, there is diversity, there is more or less of power; that the lowest only means incipient form, and over it is a higher class in which its rudiments are opened, raised to higher powers; that there is development from less to more, from lower to superior function, steadily ascending to man. If man has organs for breathing, for sight, for locomotion, for taking food, for digesting, for protection by house-building, by attack and defence, for reproduction and love and care of his young, you shall find all the same in the muskrat. There is a perfect correspondence; or ’tis only man modified to live in a mud-bank. A fish in like manner is man furnished to live in the sea; a thrush, to fly in the air; and a mollusk is a cheap edition with a suppression of the costlier illustrations, designed for dingy circulation, for shelving in an oyster-bank or among the sea-weed.