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 curious and useful thoughts, which might never otherwise have been suggested, and it also stimulates reflection in the student. The history of the erratic course which the human spirit has taken in the experience even of profound thinkers, is besides fitted to moderate dogmatism. The men of mightiest genius are found often to have fallen into the most signal errors. It is morally useful to train the mind in the habit of calmly apprehending and appreciating new doctrines, however opposed to what one has previously been accustomed to entertain. "Man," says Pascal, "is made for thinking. To think as we ought is the sum of human duty." Habits of abstract meditation have, moreover, a use additional to their absolute value to the individual speculator; they accustom men to a kind of exercise which must always be closely connected with the great progress epochs of history; and by the lucid and comprehensive views which they foster, as well as by the invigorating effect of the act of self-inspection, they become a potent force among those at work in society.

Some knowledge of the personal history of Leibnitz is likely, besides its intrinsic use and interest, to be a valuable help to the reader who desires to understand and appreciate his writings. It is satisfactory to find that most of the materials collected by former biographers, eulogists, and commentators, along with some new information, have lately been condensed into a useful biography by Dr. Guhrauer, who has already laboriously edited several of the works of Leibnitz, and contributed