WORKS BY JOHN TYNDALL, D.C.L., LL.D., F.R.S. 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 Para-
magnetic and Diamagnetic Forces-Physical Basis of Solar Chemistry-Elementary
Magnetism-On Force-Contributions to Molecular Physics-Life and Letters of
FARADAY-The Copley Medallist of 187c-The Copley Medallist 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 Ma-
terialism-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-Spon-
taneous Generation-Science and Man-Professor VIRCHOW and Evolution-The
Electric Light.

NEW FRAGMENTS.

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CONTENTS.-The Sabbath-Goethe's 'Farbenlehre '-Atoms, Molecules, and Ether Waves -Count Rumford-Louis Pasteur, his Life and Labours-The Rainbow and its CongenersAddress 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., IOS. 6d.

HEAT, A MODE OF MOTION. With 125 Woodcuts and Diagrams. Crown 8vo., 125.

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 MAGNECRYSTALLIC 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., Is. 6d. NOTES OF A COURSE OF SEVEN LECTURES ON ELECTRICAL PHENOMENA AND THEORIES, delivered at the Royal Institution of Great Britain, 1870. Crown 8vo., Is. 6d.

LESSONS IN ELECTRICITY AT THE ROYAL INSTITUTION 1875-1876. With 58 Woodcuts and Diagrams. Crown 8vo., 2s. 6d. THE GLACIERS OF THE ALPS: being a Narrative of Excursions and Ascents. An Account of the Origin and Phenomena of Glaciers, and an Exposition of the Physical Principles to which they are related. numerous Illustrations. Crown 8vo., 6s. 6d. net.

FARADAY AS A DISCOVERER. Crown 8vo., 3s. 6d.

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ADVANCED SCIENCE MANUALS.

**Written specially to meet the requirements of the ADVANCED STAGE of Science Subjects as laid down in the Syllabus of the Directory of the SCIENCE AND ART DEPARTMENT, SOUTH KENSINGTON.

PRACTICAL, PLANE, AND SOLID, TEXT - BOOK ON PRACTICAL,

GEOMETRY, including Graphic

SOLID, OR DESCRIPTIVE GEOMETRY. BY DAVID ALLAN LOW (Whitworth Scholar). Part I. Crown 8vo., 25. Part II. Crown 8vo., 35.

ART STUDENTS. Embracing AN INTRODUCTION TO MACHINE

Plane Geometry and its Applications,
the Use of Scales, and the Plans and
Elevations of Solids, as required in
Section I. of Science Subject I.
I. H. MORRIS. Crown 8vo., Is. 6d.

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DRAWING AND DESIGN. By
DAVID ALLAN Low (Whitworth
Scholar). With 97 Illustrations and
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