He retires to Holland 491 His Publications 492 He begins by doubting all 492 His First Step in Knowledge 492 His Mind not Sceptical 493 He arrives at more Certainty 493 His Proof of a Deity 493 Another Proof of it 494 His Deductions from this 494 Primary and Secondary Qualities 495 Objections made to his Meditations 495 Theory of Memory and Imagination 496 Seat of Soul in Pineal Gland 497 Gassendi’s Attacks on the Meditations 497 Superiority of Descartes 497 Stewart’s Remarks on Descartes 498 Paradoxes of Descartes 499 His Just Notions and Definitions 500 His Notion of Substances 501 Not Quite Correct 501 His Notions of Intuitive Truth 501 Treatise on Art of Logic 502 Merits of his Writings 502 His Notions of Free will 502 Fame of his System, and Attacks upon it 503 Controversy with Voet 503 Charges of Plagiarism 504 Recent Increase of his Fame 505 Metaphysical Treatises of Hobbes 505 His Theory of Sensation 506 Coincident with Descartes 506 Imagination and Memory 506 Discourse or Train of Imagination 507 Experience 507 Unconceivableness of Infinity 507 Origin of Language 508 His Political Theory interferes 508 Necessity of Speech exaggerated 509 Use of Names 509 Names Universal not Realities 509 How imposed 510