Rediscovery is one of the methods of progress. Very much that we believe to be original with us at the time of its discovery or invention proves in time to have been known to earlier civilizations. The elevator, or lift, is a very modern invention and we supposed it to be a natural development of our civilization, with its intensive characteristics, until an antiquarian startled us with the announcement that it was used in Rome over two thousand years ago; not, of course, as we use it, but for the same purpose, and involving the same principles. A half century ago our scientific men were enthusiastic over the truths of evolution that were being discovered and placed before western civilization. But as we learn more and more of the thought and intellectual life of the Orient it becomes clear that the idea of evolution permeated that part of the world centuries ago. Even the most recent and startling scientific discoveries occasionally serve to prove that what we supposed to be the fantastic beliefs of the ancients were really truths of nature that we were not yet able to comprehend! The transmutation of metals is an example. We have already gone far enough in that direction to show that the alchemists of old were not the foolish and superstitious people we supposed them to be. We have given far too little credit to past civilizations and we are coming to understand now that we have rated them too low. Our modesty must necessarily increase as it becomes clearer that much of our supposed contribution to the world's progress is not invention but rediscovery. We are beginning to see that it is not safe to put aside without careful examination an idea or a belief that was current in the world thousands of years ago. Like the supposed folly of the alchemists it may contain profound truths of nature that have thus far been foreign to our modes of thinking.