not easily kept alive in confinement, so that they are not often seen in aquariums. Having thus endeavored to sketch each different kind of Echinoderm, let us try to forget them all in their individuality, and think only of the structural formula that applies equally to each. In all, the body has three distinct regions, the oral, the ab-oral, and the sides; but by giving a predominance to one or other of these regions, a variety of outlines characteristic of the different groups is produced. In all, the parts radiate from the oral opening, and join in the ab-oral region. In all, this radiation is accompanied by rows of suckers following the line of the diverging rays. It is always the same structure, but, endowed with the freedom of life, it is never monotonous, notwithstanding its absolute permanence. In short, drop off the stem of the Crinoid, and depress its calyx to form a flat disk, and we have an Ophiuran; expand that disk, and let it merge gradually in the arms, and we have a Star-Fish; draw up the rays of the Star-Fish, and unite them at the tips so as to form a spherical outline, and we have a Sea-Urchin; stretch out the Sea-Urchin to form a cylinder, and we have a Holothurian. And now let me ask,--Is it my ingenuity that has imposed upon these structures the conclusion I have drawn from them?--have I so combined them in my thought that they have become to me a plastic form, out of which I draw a Crinoid, an Ophiuran, a Star-Fish, a Sea-Urchin, or a Holothurian at will? or is this structural idea inherent in them all, so that every observer who has a true insight into their organization must find it written there? Had our scientific results anything to do with our invention, every naturalist's conclusions would be colored by his individual opinions; but when we find all naturalists converging more and more towards each other, arriving, as their knowledge increases, at exactly the same views, then we must believe that these structures are the Creative Ideas in living reality. In other words, so far as there is truth in them, our systems are what they are, not because Aristotle, Linnaeus, Cuvier, or all the men who ever studied Nature, have so thought and so expressed their thought, but because God so thought and so expressed His thought in material forms when He laid the plan of Creation, and when man himself existed only in the intellectual conception of his Maker. LYRICS OF THE STREET. II. THE WEDDING. In her satin gown so fine Trips the bride within the shrine. Waits the street to see her pass, Like a vision in a glass. Roses crown her peerless head: Keep your lilies for the dead! Something of the light without Enters with her, veiled about; Sunbeams, hiding in her hair, Please themselves with silken wear; Shadows point to what shall be In the dim futurity.