It was fitting that one of the most characteristic and beautiful laws of life should be announced in the opening chapter of the Holy Bible. It was clothed in the form of an ordinance, as became it: "Let the earth bring forth the living creature after his kind, and every thing that creepeth upon the earth, after his kind." From that day to this, every living thing--beast, bird and insect, tree, shrub and plant--has produced after its kind. It is a law that runs through all animal and vegetable life. Each family in the great world of living forms was created for a special purpose, and was intended to remain pure and distinctive until the termination of its mission. Whenever the family boundaries are overstepped, the curse of nature is breathed upon the generative functions, and the illegitimate product dies out, or subsides into hopeless degeneration. The mule is a monster, and has no progeny. A plant, or a tree, never forgets itself. Cheat it of its root, and the stem remains faithful. The minutest twig, put out to nurse upon the arm of a foreign mother, feels the thrill of the great primal law in its filmiest fibre, and breathes in every expression of its life its fidelity. If you will walk with me into the garden, I will show you a mountain-ash in full bloom; but on the top of it you will see a strange little cluster of pear-blossoms. A twig from a Seckel pear-tree was, two or three years since, engrafted there. It had a hard time in uniting its being to that of the alien ash, but it loved life, and so, at length, it consented to join itself to the transplanted forest tree. It was weak and alone, but it kept its law. Spring bathed the ash with its own peculiar bloom, and autumn hung it with its clusters of scarlet berries, and it was hidden from sight by the redundant foliage, but it kept its law. The roots of the mountain-ash, blindly reaching in the ground and imbibing its juices, knew nothing of the little orphaned twig above, that waited for its food; but they could not cheat it of its law. Up to a certain point of a certain bough the rising fluids came under the law of the mountain-ash, and there they found a gateway, guarded by an angel that gave them a new commandment. "Thus far--mountain-ash: beyond--Seckel pear;" and if, in October, you will walk in the garden again with me, I will show you among the scarlet berries, bending heavily toward you, the clustered succulence of the Seckel.