dare partake of the food. The berry of the berberis vulgaris is a pleasant acid fruit; the bough that bears it is intensely bitter. Such examples might be multiplied indefinitely, but I have cited enough to illustrate the fact that neither the difference in size and structure of the species in the mushroom forest through which we are passing, nor the conditions of these bodies, as compared with those you formerly knew, need excite your astonishment. Cultivate a potato in your former home so that the growing tuber is exposed to sunshine, and it becomes green and acrid, and strongly virulent. Cultivate the spores of the intra-earth fungi about us, on the face of the earth, and although now all parts of the plants are edible, the species will degenerate, and may even become poisonous. They lose their flavor under such unfavorable conditions, and although some species still retain vitality enough to resist poisonous degeneration, they dwindle in size, and adapt themselves to new and unnatural conditions. They have all degenerated. Here they live on water, pure nitrogen and its modifications, grasping with their roots the carbon of the disintegrated limestone, affiliating these substances, and evolving from these bodies rich and delicate flavors, far superior to the flavor of earth surface foods. . On the surface of the earth, after they become abnormal, they live only on dead and devitalized organic matter, having lost the power of assimilating elementary matter. They then partake of the nature of animals, breathe oxygen and exhale carbonic acid, as animals do, being the reverse of other plant existences. Here they breathe oxygen, nitrogen, and the vapor of water; but exhale some of the carbon in combination with hydrogen, thus evolving these delicate ethereal essences instead of the poisonous gas, carbonic acid. Their substance is here made up of all the elements necessary for the support of animal life; nitrogen to make muscle, carbon and hydrogen for fat, lime for bone. This fungoid forest could feed a multitude. It is probable that in the time to come when man deserts the bleak earth surface, as he will some day be forced to do, as has been the case in frozen planets that are not now inhabited on the outer crust; nations will march through these spaces on their way from the dreary outside earth to the delights of the salubrious inner sphere. Here then, when that day of necessity appears, as it surely will come under inflexible
