Among those who assert that the canals are artificial we have Professor Percival Lowell as pre-eminent. He has erected an observatory in the region of one of the clearest atmospheres in the world, has furnished it with the finest telescope that Clark ever made, and for the chief purpose of studying the surface features of Mars. In his interesting book on Mars he has presented the results of his observations in so lucid and convincing a manner that a reviewer of the English edition of the work, in an English astronomical journal, is led to write: "We may say at once that we feel bound to accept these observations as sufficient evidence of the real existence of the markings without expressing an opinion as to what they may be." The reviewer ends by saying: "Indeed, there is a subtle deftness in the way Mr. Lowell deals with his observations which gives the impression that he has been there and seen it all, and it is really hard to say why we cannot accept his conclusions. It is probable, because we are shy to receive new facts at a first statement. In time, no doubt, we shall be willing to accept his deductions (or facts) as to the markings. We were about to advance objections, but they seem poor, and really it is a case where each person must read and form his own ideas--but by all means read." We have already presented a summary of his observations. We may add here, however, an extract from his book on the solar system. In this Mr. Lowell says of Mars: "What we see hints of the existence of beings who are in advance of, not behind us in the journey of life," and again: "Life on Mars must take on a very different guise from what it wears on the Earth. It is certain there can be no man there--that is as certain as anything can be. But this does not preclude a local intelligence equal to, and perhaps easily superior to, our own. We seem to have evidence that something of the sort does exist there at the present moment and has made imprint of its existence far exceeding anything we have left on Mother Earth." George W. Morehouse, in his "Wilderness of Worlds," says: "Taken all together we must regard Mars as probably an inhabited world and very similar to the Earth." Mr. Hector Macpherson, Jr., member of the Astronomical Society of France, in his interesting book "Astronomers of To-day," says, in regard to Mr. Lowell's book on Mars: "He does not ask us to believe anything fantastical or extravagant. His hypothesis has been framed to account for all the various Martian features. At present we can only say that it is the most comprehensive and probable theory yet advanced to explain the phenomena of the red planet."