taining to the senses, on the other hand, are indistinct, and comparatively unimportant. The multitude of immovable eyes appear not so much conductors of light, as its ultimate recipient. We are almost tempted to believe that they constitute, rather than subserve, their sensorium.
These eye-facets form the sense of light, rather than organs of seeing. Their almost paradoxical number at least, and the singularity of their forms, render it probable that they impel the animal by some modification of its irritability, herein likewise containing a striking analogy to the known influence of light on plants, than as excitements of sensibility. The sense that is nearest akin to irritability, and which alone resides in the muscular system, is that of touch, or feeling. This, therefore, is the first sense that emerges. Being confined to absolute contact, it occupies the lowest rank; but for that very reason it is the ground of all the other senses, which act, according to the ratio of their ascent, at still increasing distances, and become more and more ideal, from the tentacles of the polypus, to the human eye; which latter might be defined the outward organ of the identity, or at least of the indifference, of the real and ideal. But as the calcareous residuum of the lowest class approaches to the nature of horn in the snail, so the cumbrous shell of the snail has been transformed into polished and moveable plates of defensive armour in the insect. Thus, too, the same power of progressive individuation articulates the tentacula of the polypus and holothuria into antennæ; thereby manifesting the full emersion and eminency of irritability as a power which acts in, and gives its own character to, that of reproduction. The least observant must have noticed
