The further Science penetrates into the secrets of the universe the more regular seems the march of thought presented there; the more harmonious the various parts; the more rational the grand system that is discovered. "How the one force of the universe should have pursued the pathway of Evolution through the lapse of millions of ages, leaving traces so legible by intelligence to-day, unless from beginning to end the whole process had been dominated by intelligence," this is something, as Francis Abbot well says, that passes the limits of conjecture. The all-luminous intelligibility of the universe is the all-sufficient proof of the intelligence of the cause that produced it. In the annals of science there is nothing more curious than the prophetic power which those savans have gained who have grasped this secret of nature--the rationality of the universe. It was by this confidence in finding in the hitherto unexplored domains of nature what reason demanded, that Goethe, from the analogies of the mammalian skeleton, discovered the intermaxillary bone in man; and Sir William Hamilton, from the mathematical consequences of the undulation of light, led the way to the discovery of conical refraction. A similar story is told of Prof. Agassiz and Prof. Pierce, the one the great zooelogist, the other the great mathematician, of Cambridge. Agassiz, having studied the formation of radiate animals, and having found them all referable to three different plans of structure, asked Prof. Pierce, without informing him of his discovery, how to execute all the variations possible, conformed to the fundamental idea of a radiated structure around a central axis. Prof. Pierce, although quite ignorant of natural history, at once devised the very three plans discovered by Agassiz, as the only fundamental plans which could be framed in accordance with the given elements. How significantly do such correspondences speak of the working of mind in nature, moulding it in conformity with ideas of reason. Thus to see the laws of thought exhibiting themselves as also the laws of being seems to me a fact sufficient of itself to prove the presence of an over-ruling mind in nature. Is there any way of escaping this obvious conclusion? The only method that has been suggested has been to refer these harmonies of nature back to the original regularity of the atoms. As the drops of frozen moisture on the window pane build up the symmetrical frost-forms without design or reason, by virtue of the original similarity of the component parts, so do the similar atoms, without any more reason or plan, build up the harmonious forms of nature.