appear, then it is he realises that in the body of the individual the whole evolutionary course of nature is traced and repeated; that in that highest, the human, form all the past history of the evolution of forms is broadly indicated; and that while, of course, details cannot be observed, the great succession is seen there, the invariable sequence ever repeated in the highest, the noblest form. And, working back with the light of that, science was then able to recognise very clearly the evolutionary stages of which geology yielded up its imperfect fossil record; for there it found the great age of the fishes, with no higher form of vertebrate life existing; then it found the age of the reptiles, then that of the mammals, finally the human kingdom; and looking over the past in that way, illuminated by the observations of the present, science recognised the truth of that ancient principle of correspondences which serves as a clue in distant regions where observations well-nigh fail us, and enables us, by the use of analogy, to trace our way among the labyrinths of the past. It is not only along this line of æonian evolution and embryological growth that science has found help from this application of the principle of correspondences. It has found that not only in the state of bodies but also in the state of minds the same principle serves as its best clue once again in the labyrinth of the past. It has found out that the stages of human consciousness may be traced from the earliest stage of the will to live, then upwards through the unfolding consciousness of the child, in the stage of passions of the youth, in the stage of mentality dominating the maturity of man; and it goes along these lines into very much of detail, showing us how at a certain stage the child is reproducing the savage condition of consciousness; how a little later it grows out of that into the passional and barbarous; then through that into the emotional, where art and beauty begin to show themselves as outgrowths from human nature; and then on, at later stages, to that splendid mentality which it regards as the crown of human consciousness. Along these lines, which will be familiar to all the thoughtful and the cultured amongst you, science has been led to new discoveries, has been able in this fashion to find out many of the hidden things of nature.