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quiry after Truth, being a Demonstration of the Non-Existence, or Impossibility of an External World," which gives his perfected theory of the non-existence of matter. After this, a period of almost twenty years elapsed, with only his correspondence to show his interest in the application of his theory until in 1730, he published the "Specimen of True Philosophy." This was followed in 1732 by his "Logology," which is the last of his published writings. The monumental work of his life, the explication of the Scriptures, of which the "Genesis" and "Logology" were the beginnings, was never completed, for he died in the year in which the latter was printed. He was buried in the Langford Church, September 9th, 1732.

But although Collier himself laid such stress upon the theological bearing of his theory, the treatises which discuss the interpretation of the Scriptures have little value when compared with the one philosophical essay, which seemed to him to serve mainly as an introduction to what was to follow. At most, the interest of these theological treatises lies in the more definite suggestions of the positive aspect of his philosophic thought. Disentangled from its scholastic phraseology, his system is a theistic spiritualism. It rests on two fundamental propositions: (1) "God made heaven and earth, or the whole material world, Ἐν Ἀρχῆι," and (2) "the visible or material world exists in mind, i. e., immediately in the mind of him that seeth or