For, the problems to be solved are precisely those which the physiologist and the naturalist omit to state. It is not so pertinent to man to know all the individuals of the animal kingdom, as it is to know whence and whereto is this tyrannizing unity in his constitution, which evermore separates and classifies things, endeavoring to reduce the most diverse to one form. When I behold a rich landscape, it is less to my purpose to recite correctly the order and superposition of the strata, than to know why all thought of multitude is lost in a tranquil sense of unity. I cannot greatly honor minuteness in details, so long as there is no hint to explain the relation between things and thoughts; no ray upon the _metaphysics_ of conchology, of botany, of the arts, to show the relation of the forms of flowers, shells, animals, architecture, to the mind, and build science upon ideas. In a cabinet of natural history, we become sensible of a certain occult recognition and sympathy in regard to the most unwieldly and eccentric forms of beast, fish, and insect. The American who has been confined, in his own country, to the sight of buildings designed after foreign models, is surprised on entering York Minster or St. Peter's at Rome, by the feeling that these structures are imitations also,--faint copies of an invisible archetype. Nor has science sufficient humanity, so long as the naturalist overlooks that wonderful congruity which subsists between man and the world; of which he is lord, not because he is the most subtile inhabitant, but because he is its head and heart, and finds something of himself in every great and small thing, in every mountain stratum, in every new law of color, fact of astronomy, or atmospheric influence which observation or analysis lay open. A perception of this mystery inspires the muse of George Herbert, the beautiful psalmist of the seventeenth century. The following lines are part of his little poem on Man. "Man is all symmetry, Full of proportions, one limb to another, And to all the world besides. Each part may call the farthest, brother; For head with foot hath private amity, And both with moons and tides. "Nothing hath got so far But man hath caught and kept it as his prey; His eyes dismount the highest star; He is in little all the sphere. Herbs gladly cure our flesh, because that they Find their acquaintance there. "For us, the winds do blow, The earth doth rest, heaven move, and fountains flow; Nothing we see, but means our good, As our delight, or as our treasure; The whole is either our cupboard of food, Or cabinet of pleasure.