FRANKLIN (Benjamin) Letters and Papers on Philosophical Subjects. 8vo. Complete Works, Vol. I. [Ee. 2. 67.]

Another Copy. 4to. In his " Posthumous Writings." [Gg. 1.10.]
Another Copy. 8vo. In his " Posthumous Writings," Vol. II.

[Ee. 2. 74.]

FRISII (Paulli) De Gravitate Universali Corporum Libri Tres.
Mediolani, 1768. [Ee. 1. 36.]

GASSENDI (Petri) De Proportione, qua Gravia decidentia accelerantur,
Epistolæ Tres. 4to. Paris. 1646. [G. 6. 25.]

GODFREY (Boyle) Miscellanea verè Utilia: or, Miscellaneous Experiments and Observations on various Subjects. 8vo. London, 1737.

[P. 90. (4.)] GREEN (Robert) Principles of Natural Philosophy, in which is shewn the Insufficiency of the present Systems, and the Necessity of new Principles to furnish us with a true and real Knowledge of Nature. Cambridge, 1712. [I. 14. 24.]

Svo.

GULDINI (P.) De Centro Gravitatis. folio, Viennæ, 1635. [D. 2. 28.] HALES (Stephen) Philosophical Experiments. 8vo. London, 1739.

[P. 118. (1.)] Hales (Stephen) A Description of Ventilators and their Usefulness in preserving and drying Corn, Malt, and Hops. 8vo. London, 1743. [P. 118. (2.)] Hales (Stephen) An Account of a useful Discovery to distill double the usual Quantity of Sea Water, by blowing Showers of Air up through the distilling Liquor; and an Account of the Benefit of Ventilators in Ships. 8vo. London, 1756. [P. 220. (3.)]

BUTLER (Thomas) A Safe, Easy, and Expeditious Method of procuring any Quantity of Fresh Water at Sea, by a Menstruum entirely innocent and inoffensive. 8vo. London, 1755. [P. 220. (4.)]

HAMILTON (Hugh) Introductory Lectures in Natural Philosophy. 8vo. Dublin, 1774. [F. 26. 26.]

HARVEY (Gideon) New Principles of Philosophy. 4to. London, 1663. [F. 15. 35.] HAUKSBEE (F.) Physico-Mechanical Experiments on various Subjects. 4to. London, 1709. [Ee. 4. 37.]

Another Copy, interleaved. 4to. [E. 1. 48.]

HEEREBOORD (Adriani) Philosophia Naturalis cum commentariis peripateticis. Svo. Oxon. 1668. [D. 15. 30.]

HELSHAM (Richard) A Course of Lectures on Natural Philosophy. 8vo. London, 1767. [Ee. 4. 38.]

Another Copy. 8vo. London, 1755. [Ee. 4. 39.]

HOBBES (Thomas) Decameron Physiologicum: or, Ten Dialogues of Natural Philosophy. To which is added, the Proportion of a straight Line to half the Arc of a Quadrant. 8vo. London, 1678. [R. 9. 73.] HOOKE (Robert) Micrographia: or, Physiological Descriptions of Minute Bodies made by Magnifying Glasses. folio, London, 1665. [F. 9. 16.] Hooke (Robert) Philosophical Experiments and Observations. 8vo. London, 1726. [Ee. 4. 40.]

Hooke (Robert) Philosophical and Mathematical Tracts. 4to. London, 1674-82. [Ee. 4. 41.]

Hooke (Robert) Posthumous Works, containing his Cutlerian Lectures, and other Discourses before the Royal Society. folio, London, 1705.

[Ff. 3. 60.] IMISON (John) Elements of Science and Art; being a familiar Introduction to Natural Philosophy and Chemistry. A new edition revised and corrected by Thomas Webster. 2 vols. 8vo. London, 1808.

[Dd. 3. 72,73.] INGENHOUSZ (Jean) Nouvelles Experiences et Observations sur divers Sujets de Physique. 8vo. Paris, 1785. [Ee. 4. 42.]

JONES (William) An Essay on the First Principles of Natural Philosophy. 4to. Oxford, 1762. [Ee. 1. 51.]

KEILLII (Joannis) Introductio ad Veram Physicam, seu Lectiones PhySvo. London, 1719. [R. 9. 50.]

sicæ.

Keill (John) An Introduction to Natural Philosophy. 8vo. London, 1733.

[Dd. 2. 13.] KIRWAN (Richard) An Estimate of the Temperature of different Latitudes. 8vo. London, 1787. [Hh. 3. 39.] KIRCHERI (Athanasii) Ars Magna Lucis et Umbræ. folio, Roma, 1606. [D. 2. 22.] LESLIE (John) An Experimental Inquiry into the Nature and Propagation of Heat. 8vo. London, 1804. [Dd. 2. 64.]

Another Copy. Svo. London, 1804. [Ee. 2. 64.] LICETUS (Fortunatus) De Monstris. 4to. Amstel. 1665. [F. 15. 21.] LINI (Francisci) De Corporum Inseparabilitate. 12mo. Londini, 1641. [E. 8. 7.] MALUS (E. L.) Théorie de la Double Refraction de la Lumière dans les Substances Crystallisées. 4to. Paris, 1810. [Ee. 1. 3.] MARTIN (Benjamin) Philosophia Britannica: or, a New and Comprehensive System of the Newtonian Philosophy, Astronomy, and Geography. 3 vols. 8vo. London, 1771. [Dd. 1. 4–6.]

Martin (Benjamin) The Young Gentleman's and Lady's Philosophy, in a continued Survey of the Works of Nature and Art. 8vo. London, 1772. [Dd. 1. 7,8.]

MAYOW (Johannis) Tractatus Quinque Medico-Physici: 1. De SalNitro, et Spiritu Nitro-aereo; 2. De Respiratione; 3. De Respiratione Fœtus in Utero et in Ovo; 4. De Motu Musculari in Spiritibus Animalibus; 5. De Rachitide. 8vo. Oxonii, 1674. [H. 20. 38.] MILNER (Isaac) Plan of a Course of Experimental Lectures. bridge. [Hh. 4. 40.]

8vo. Cam

Another Copy. 8vo. Cambridge. [Hh. 2. 33.] NEWCASTLE (Margaret, Duchess of) Grounds of Natural Philosophy. folio, London, 1668. [B. 1. 4.]

Newcastle (Margaret, Duchess of) Observations upon Experimental Philosophy; to which is added, the Description of a new Blazing World. folio, London, 1668. [B. 1. 5.]

Newcastle (Margaret, Duchess of) Philosophical Letters. folio, London, 1664. [B. 1. 8.]

Newcastle (Margaret, Duchess of) Philosophical and Physical Opinions. 2 vols. folio, London, 1655-63. [B. 1. 11,13.7

NEWTONI (Isaaci) Philosophiæ Naturalis Principia Mathematica. 4to.
Londini, 1687. [H. 5. 28.]

Exemplar aliud. Editio tertia. 4to. Londini, 1726. [L. 6. 6.]
Exemplar aliud. 4to. Geneva, 1739. [P. 3. 1.]

Newtoni (Isaaci) Philosophiæ Naturalis Principia Mathematica, perpetuis
Commentariis illustrata communi studio PP. Thomæ Le Sueur et Fran-
cisci Jacquier. 4 tomis, 4to. Genevæ, 1739-42. [Cc. 2. 23-26.]
Newtoni (Isaaci) Principia cum Commentariis Tho. Le Sueur et Francisci
Jacquier. 3 tomis, 4to. Coloniæ, 1760. [Ee. 1. 19-21.]

Exemplar aliud. 3 tomis in 2 vols. 4to. [P. 3. 1, 2a.] Excerpta Quædam e Newtoni Principiis Philosophiæ Naturalis, cum notis variorum. [Edidit Johannes Jebb.] (Exemplaria quatuor.) 4to. Cantabrigiæ, 1765. [Gg. 2. 7-10.]

Exemplar aliud. 4to. Cantabrigiæ, 1765. [G. 14. 29.] Newton (Sir Isaac) The Mathematical Principles of Natural Philosophy, translated into English by Andrew Motte, with additional Illustrations by William Emerson and others. 3 vols. 8vo. London, 1803.

[Dd. 1. 17-19.]

Another Copy. 3 vols. 8vo. London, 1803. [Gg. 5. 17-19.] Newton (Sir Isaac) Mathematical Principles of Natural Philosophy. Book the First. Translated into English, and illustrated with a Commentary. By Robert Thorp, D. D. 4to. London, 1802. [Cc. 2. 33.] PEMBERTON (Henry) A View of Sir Isaac Newton's Philosophy. 4to. London, 1728. [N. 1. 32.]

MACLAURIN (Colin) An Account of Sir Isaac Newton's Philosophical Discoveries. 4to. London, 1748. [Cc. 2. 31.]

'SGRAVESANDE (Gul. Jac.) Physices Elementa Mathematica experimentis confirmata; sive Introductio ad Philosophiam Newtonianam. 2 vols. 4to. Lug. Bat. 1720-25. [A. 1. 27,28.] 'sGravesande (W. J.) An Explanation of the Newtonian Philosophy in Lectures read in the University of Leyden. 8vo. London, 1735.

[R. 12. 24.] EMERSON (William) A Short Commentary on Sir I. Newton's Principia. Svo. London, 1770. [Gg. 5. 24.]

Another Copy. 8vo. Works, Vol. XIII. [E. 25. 26.] ROBINSON (Bryan) Dissertation on the Ether of Sir Isaac Newton.

London, 1747. [Dd. 4. 77.]

8vo.

LUDLAM (William) An Essay on Sir Isaac Newton's second Law of Motion. 8vo. London, 1780. [Hh. 3. 31.]

JORDAN (-) The Observations of Newton concerning the Inflections of Light; accompanied by other Observations differing from his, and appearing to lead to a change of his Theory of Light and Colours. 8vo. London, 1799. [Ee. 2. 16.]