The resemblances between the embryonic development of man and the other mammals present another instance of the constantly occurring fact that there has been no waste of power on the one hand, and on the other no failure to exert the amount of power requisite to produce a new variation of the general principle. There is no more logical force in the hypothesis of a common progenitor, in order to account for these resemblances, than there is in the hypothesis that the general system of embryonic development was first devised, and that it was then varied in each distinct animal according to the requirements of its special construction. Upon the latter supposition, there would be resemblances to a certain stage, and then there would follow the departures which we have no difficulty in tracing. Upon the former supposition we should expect to find, what we actually do find, that it is very difficult, if not impossible, to assign any reason for the departures, or to suggest how it has happened that one animal is so absolutely distinct from another. Thus, to begin with the embryo itself, and to trace it through its stages of development, we find that in man it can hardly be distinguished from that of other members of the vertebrate kingdom. This we should expect to be the case after we have learned the great fact that Nature operates upon a uniform principle up to the point where variations and departures are to supervene. The system of embryonic development being devised to operate in parallel lines through all the placental mammals until the lines should begin to depart from each other so as to result in animals of different species, would necessarily show strong resemblances of structure until the departures supervened. There would be, in other words, a strong illustration of the truth that in the Divine economy there is no waste of power. But when the stage is reached at which the departures may be noted, and the lines diverge into the production of organized beings differing widely from each other, we reach an equally striking illustration of the corresponding truth that the amount of power necessary to produce very different results never fails to be put forth. There is no good reason why this latter exertion of power should not be attributed to special design just as logically and rationally as we must attribute to intentional purpose and infinite skill the general system of embryonic development which has been made for the whole class of the placental mammals. While, therefore, we may accept as a fact Prof. Huxley's statement on this branch of comparative anatomy, we are under no necessity to accept his conclusion. To the question whether man originates in a different way from a dog, bird, frog, or fish, this anatomist answers, as already quoted: "The reply is not doubtful for a moment; without question, the mode of origin and the early stages of the development of man are identical with those