impressive, the power of sound, with the first rudiments of modulation! That all languages designate the melody of birds as singing (though according to Blumenbach man only sings, while birds do but whistle), demonstrates that it has been felt as, what indeed it is, a tentative and prophetic prelude of something yet to come. With this conjoin the power and the tendency to acquire articulation, and to imitate speech; conjoin the building instinct and the migratory, the monogamy of several species, and the pairing of almost all; and we shall have collected new instances of the usage (I dare not say law) according to which Nature lets fall, in order to resume, and steps backward the furthest, when she means to leap forwards with the greatest concentration of energy.
For lo! in the next step of ascent the power of sensibility has assumed her due place and rank: her minority is at an end, and the complete and universal presence of a nervous system unites absolutely, by instanteity of time what, with the due allowances for the transitional process, had before been either lost in sameness, or perplexed by multiplicity, or compacted by a finer mechanism. But with this, all the analogies with which Nature had delighted us in the preceding step seem lost, and, with the single exception of that more than valuable, that estimable philanthropist, the dog, and, perhaps, of the horse and elephant, the analogies to ourselves, which we can discover in the quadrupeds or quadrumani, are of our vices, our follies, and our imperfections. The facts in confirmation of both the propositions are so numerous and so obvious, the advance of Nature, under the predominance of the third synthetic power, both in the intensity of life and in
