plication, seem to such dreaming minds more notable truths, deeper revelations of efficacious reality, than the mechanical necessities of the case, which they scarcely conceive of; and in this primordial prejudice they are confirmed by superstitious affinities often surviving in their religion and philosophy. In the midst of cities and affairs they are like landsmen at sea, incapable of an intellectual conception of their position: nor have they any complete confidence in their principles of navigation. They know the logarithms by rote merely, and if they reflect are reduced to a stupid wonder and only half believe they are in a known universe or will ever reach an earthly port. It would not require superhuman eloquence in some prophetic passenger to persuade them to throw compass and quadrant overboard and steer enthusiastically for El Dorado. The theory of navigation is essentially as speculative as that of salvation, only it has survived more experiences of the judgment and repeatedly brought those who trust in it to their promised land.
The theory that all real objects and places lie together in one even and homogeneous space, conceived as similar in its constitution to the parts of extension of which we have immediate intuition, is a theory of the greatest practical importance and validity. By its light we carry on all our affairs, and the success of our action while we rely upon it is the best proof of its truth. The imaginative