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present is merely an example of one phase of planetary development, i.e., one in which life can exist; that some worlds are like it (though none in precisely the same condition); that others are as yet in a primitive state, just as the Earth was in the period of, say, the secondary formations; that others, however, are more highly developed than this world; and, finally, that in others life is extinct. This ideal is much the same as that of Oersted, who says: "On some planets the creatures may be possibly on a far larger scale, on others far smaller, than on our own; on some, perhaps, they are formed of less solid matter, or may, indeed, approach the transparency of ether; or, on others again, be formed of much denser matter. The rational creatures on some of the planets may be capable of receiving far quicker, more acute, and more distinct impressions than on the Earth. We may imagine that there are reasonable beings with weaker faculties than our own" (as I have in these pages supposed to be the case); "but, if we properly appreciate our present distance from the aspirations of our reason, we feel compelled to acknowledge that an endless number of degrees of development may exist above the point we have reached."