achievements of science have transpired by slow degrees, and yield a distinction to be divided among a fellowship of kindred spirits, rather than assigned exclusively to a solitary example of mental prowess. If Keppler discovered the general laws of the universe, the basis of the discovery was laid by Tycho; and the marvelous Napier contributed essentially to the issue obtained, by the invention of the logarithms, an admirable artifice, as it has been justly called, which, by reducing to a few days the labor of many months, doubles the life of the astronomer, and saves him the errors and disgust connected with long calculations. If Newton developed the cause of those laws, he started to his grand result from a point expressly prepared by Keppler, and left the solution of the problem imperfect, for Laplace to finish. It is obviously in wise accordance with the happiness of mankind, that no nation possesses a monopoly of talent and fame, that many of the most remarkable efforts of human genius owe a debt of obligation to the accomplishments of genius at another era, and in a different clime. The fact proclaims the affinity of the species, between whom the mighty deep may roll, or the mountain rampart rise. It evinces, too, their mutual dependence, and will be hailed as a motive by the considerate mind, to the maintenance of universal amity. To Hevelius, one of the merchant princes of Dantzic, an example of the close alliance of commerce with the fine arts and science which runs through the page of history, we owe the first accurate delineation of the lunar surface, the discovery of a libration in longitude; by his observation of the comet of 1664, he further corroborated the view previously taken, that such bodies are not sublunary, and approximated to the nature of their orbits. His contemporary Huygens, after effecting various improvements in the telescope, discovered one of the satellites of Saturn, that which is now termed the fourth, and obtained an insight into the singular structure of the planet, an inexplicable appearance to all preceding observers. An anagram, in the year 1656, announced to the world the following sentence by a transposition of letters, _annulo_ _cingitur, tenui, plano, nusquam cohærenta, ad eclipticam,_ _inclinatio_—the planet is surrounded with a ring, thin, plane, nowhere adhering, and inclined to the ecliptic. He justly observes, in a letter to his brother: “If any one shall gravely tell me that I have spent my time idly in a vain and fruitless inquiry, after what I can never become sure of; the answer is, that at this rate, he would put down all natural philosophy, as far as it concerns itself in searching into the nature of things. In such noble and sublime studies as these, it is a glory to arrive at probability, and the search itself rewards the pains. But besides the nobleness and pleasure of the studies, may we not be so bold as to say, they are no small help to the advancement of wisdom and