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By this edition of Collier's "Clavis Universalis" it is hoped to call attention to a book otherwise inaccessible, which, though curiously parallel to Berkeley's contemporary works, has undoubted independent value; and which anticipates Kant's first two antinomies. The whole history of philosophy perhaps presents no more striking example of undeserved neglect, and no more curious coincidence of thought than the eighteenth century in England. By entirely different modes of approach and unknown to cach other, Berkeley and Collier reached the same conclusion,—that matter, as conceived by traditional philosophy, is non-existent.

This edition of the "Clavis Universalis" is an exact and verified copy of the essay as it appears in Dr. Parr's "Metaphysical Tracts of the Eighteenth Century," a book now out of print. The Introduction and Notes are modified extracts from a Master's thesis accepted by the faculty of Wellesley College. They aim to show the direct dependence of Collier upon Des Cartes, Malebranche, and Norris, as well as the parallelism of Collier and Berkeley.

The thanks of the editor are due to Professor