But this was not the comment we designed to make. Dr. Cooper labors, with most professional botanists, under the delusion that all our plants and trees originated in some one "centre of creation," at some period or other in time and place, and have been steadily spreading themselves outward from that centre until they occupy their present areas of distribution. We have no objection to his clinging to this superannuated faith and belief, if he derives any pleasure in flushing up these "traditional grasshoppers." But we have a right to insist that he shall be logical. He wants it distinctly understood that trees are made _for_, and not _by_, climate. Then his "centre of creation" should be everywhere, not a localized one. For he insists that no alteration can be produced by climate, but that the characteristics of each specific form are preserved throughout its entire range of distribution. But if these nomadic and migratory forms have wandered thus far from their centres of creation, it would seem that the trees had either adapted themselves to the climate, or the climate to the trees. But our Smithsonian systematizer will allow us neither horn of this dilemma. He insists that the trees were made for the climate, and that they have preserved their characteristic features during their entire ambulation upon the earth's surface. With the change of a single monosyllabic predicate, this proposition is undoubtedly true. We have never heard that plants or trees were "made." They were ordered "to grow," or rather the earth was commanded to bring them forth, which is an equivalent induction. And the fact that they grow now, renders it absolutely certain that they grew at first, when "out of the ground made the Lord God _to grow_" every plant of the field, and every tree that is pleasant to the sight. We accept this genesis for the want of a better. And if Dr. Cooper will add to his climatic conditions, the hygrometric and other conditions necessary for the development and growth of his plants and trees, we will agree with him to the fullest extent of his novel position--that trees neither adapt themselves to the climate, nor the climate to the trees; although it is true that trees modify climate quite as much as they are modified by it. The true physiological formula is undoubtedly this:--Trees make their appearance _in_ climatic and other environing conditions, and flourish, without material change in characteristics, so long as these conditions favor. _Why_ they make their appearance is not a debatable question, except as we assume a preëxisting vital principle, and apply to its elucidation our subtlest dialectical methods. We are told that God commanded the earth to bring them forth, after _his_ spirit (the animating soul of life) had moved upon the face of the depths--the chaotic and formless mass of the earth in the beginning. Plato has uttered no profounder or more comprehensive truth than this, with all his conceptions of Deity and the