to Yucatan and Guatemala, to Egypt, Arabia, and Jerusalem, and of Dr. Grant to Nestoria, have increased our knowledge of geography and of antiquities, and have added new and striking proofs of the truths of Christianity. Fossil geology occupied much of the time and attention of the great philosopher and statesman, Jefferson, and he was rewarded by the discovery of the megatherium. The mastodon, exhumed in 1801, from the marl pits of New York, by Charles Wilson Peale, has proved but one of an order of animal giants. Even the tetracaulodon, or tusked mastodon, of Godman, upon which rested his claims to fame, is not the most curious of this order, as the investigations of Hayes and Horner have proved. This order has excited the attention, not only of such minds as Cooper, Harlan, and Hayes, but has also occupied the best naturalists of France, Britain, Germany, and Italy. Fossil conchology has attracted the attention of Conrad, the Lees, and the Rogerses, not only calling forth much ingenuity in description and classification, but also throwing great light upon the relative ages of some of the most interesting geological formations. The earthquake theory of the Rogerses is one of the boldest generalizations, founded upon physical reasoning, which our geologists have produced. In the parallel ridges into which the Apalachian chain is thrown, they see the crests of great earthquake waves, propagated from long lines of focal earthquake action, more violent than any which the world now witnesses. The geologist deals in such sublime conceptions as a world of molten matter, tossed into waves by violent efforts of escaping vapors, cooling, cracking, and rending, in dire convulsion. He then ceases to discuss the changes and formation of worlds, and condescends to inform us how to fertilize our soil, where to look for coal and iron, copper, tin, cobalt, lead, and where we need not look for either. He is the Milton of poetry, and the Watt of philosophy. And here let me add, that the recent application of chemistry to agriculture is producing the most surprising results, in increasing and improving the products of the earth, and setting at defiance Malthus's theory of population.