If we surpass preceding generations in scientific knowledge, it is because we have added our share to the discoveries which they bequeathed to us. We are their heirs, their pupils, their continuators, just as future generations will be ours. We achieve great results by the application of the power of steam; we have solved many great problems in mechanics, and pressed the elements as submissive slaves into our service. But do these successes bring us any nearer to omniscience. At most, they may enable us ultimately to fathom all the secrets of the material world. And when we shall have achieved that grand conquest, for which so much requires still to be done that is not yet commenced, nor even anticipated; have we advanced a single step beyond the simple exposition of the laws which govern the material world? We may have learned to direct our course through the air, to approach the limits of the respirable atmosphere; we may discover and elucidate several interesting astronomical problems; we may have greater powers for controlling nature and compelling her to minister to our wants, but can all this knowledge make us better, happier beings? Suppose we had counted all the planetary systems and measured the immense regions of space, would we know more of the grand mystery of existence than those that came before us? Would this add one new faculty to the human mind, or ennoble human nature by the eradication of one bad passion? Admitting that we are more enlightened upon some subjects, in how many other respects are we inferior to our more remote ancestors? Can it be doubted, for instance, that in Abraham's times much more was known of primordial traditions than the dubious beams which have come down to us? How many discoveries which we owe to mere accident, or which are the fruits of painful efforts, were the lost possessions of remote ages? How many more are not yet restored? What is there in the most splendid of our works that can compare with those wonders by which Egypt, India, Greece, and America still attest the grandeur and magnificence of so many edifices which the weight of centuries, much more than the impotent ravages of man, has caused to disappear? What are our works of art by the side of those of Athens; our thinkers by the side of those of Alexandria or India; our poets by the side of a Valmiki, Kalidasa, Homer, Pindar?