WORKS by JOHN TYNDALL.

FRAGMENTS of SCIENCE: a Series of Detached Essays, Addresses, and Reviews. 2 vols. crown 8vo. 16s.

VOL. I.—The Constitution of Nature—Radiation—On Radiant Heat in Relation to the Colour and Chemical Constitution of Bodies—New Chemical Reactions produced by Light—On Dust and Disease—Voyage to Algeria to observe the Eclipse—Niagara—The Parallel Roads of Glen Roy—Alpine Sculpture—Recent Experiments on Fog-Signals—On the Study of Physics—On Crystalline and Slaty Cleavage—On Paramagnetic and Diamagnetic Forces—Physical Basis of Solar Chemistry—Elementary Magnetism—On Force—Contributions to Molecular Physics—Life and Letters of Faraday—The Copley Medalist of 1870—The Copley Medalist of 1871—Death by Lightning—Science and the Spirits.

VOL. II.—Reflections on Prayer and Natural Law—Miracles and Special Providences—On Prayer as a Form of Physical Energy—Vitality—Matter and Force—Scientific Materialism—An Address to Students—Scientific Use of the Imagination—The Belfast Address—Apology for the Belfast Address—The Rev. James Martineau and the Belfast Address—Fermentation, and its Bearings on Surgery and Medicine—Spontaneous Generation—Science and Man—Professor Virchow and Evolution—The Electric Light.

NEW FRAGMENTS. Crown 8vo. 10s. 6d.

Contents: The Sabbath—Goethe's 'Farbenlehre'—Atoms, Molecules and Ether Waves—Count Rumford—Louis Pasteur, his Life and Labours—The Rainbow and its Congeners—Address delivered at the Birkbeck Institution on October 22, 1884—Thomas Young—Life in the Alps—About Common Water—Personal Recollections of Thomas Carlyle—On Unveiling the Statue of Thomas Carlyle—On the Origin, Propagation, and Prevention of Phthisis—Old Alpine Jottings—A Morning on Alp Lusgen.

LECTURES on SOUND. With Frontispiece of Fog-Syren, and 203 other Woodcuts and Diagrams in the Text. Crown 8vo. 10s. 6d.

HEAT, a MODE of MOTION. With 125 Woodcuts and Diagrams. Crown 8vo. 12s.

LECTURES on LIGHT DELIVERED in the UNITED STATES in 1872 and 1873. With Portrait, Lithographic Plate, and 59 Diagrams. Crown 8vo. 5s.

ESSAYS on the FLOATING MATTER of the AIR in RELATION to PUTREFACTION and INFECTION. With 24 Woodcuts. Crown 8vo. 7s. 6d.

RESEARCHES on DIAMAGNETISM and MAGNE-CRYSTALLIC ACTION; including the Question of Diamagnetic Polarity. Crown 8vo. 12s.

NOTES of a COURSE of NINE LECTURES on LIGHT, delivered at the Royal Institution of Great Britain, 1869. Crown 8vo. 1s. 6d.

NOTES of a COURSE of SEVEN LECTURES on ELECTRICAL PHENOMENA and THEORIES, delivered at the Royal Institution of Great Britain, 1870. Crown 8vo. 1s. 6d.

LESSONS in ELECTRICITY at the ROYAL INSTITUTION, 1875-1876. With 58 Woodcuts and Diagrams. Crown 8vo. 2s. 6d.

FARADAY as a DISCOVERER. Crown 8vo. 3s. 6d.

London: LONGMANS, GREEN, & CO.