Experiments on Dusty Air.

The Germ Theory of Contagious Disease.

Parasitic Diseases of Silkworms. Pasteur's Researches.

Origin and Propagation of Contagious Matter.

The Germ Theory applied to Surgery.

The Luminous beam as a means of Research.

The Floating Matter of the Air.

Dr. Bennett's Experiments.

Application of Luminous beams to Water.

Chalk-water. Clark's Softening Process.

Cotton-wool Respirator.

Fireman's Respirator.

Helmholtz on Hay Fever.

VI. VOYAGE TO ALGERIA TO OBSERVE THE ECLIPSE.

VII. NIAGARA.

VIII THE PARALLEL ROADS OF GLEN ROY.

IX. ALPINE SCULPTURE.

X. RECENT EXPERIMENTS ON FOG-SIGNALS.

XI. ON THE STUDY OF PHYSICS.

XII. ON CRYSTALLINE AND SLATY CLEAVAGE.

XIII. ON PARAMAGNETIC AND DIAMAGNETIC FORCES.

XIV. PHYSICAL BASIS OF SOLAR CHEMISTRY.

XV. ELEMENTARY MAGNETISM.

XVI. ON FORCE.

XVII. CONTRIBUTIONS TO MOLECULAR PHYSICS.

XVIII. LIFE, AND LETTERS OF FARADAY.

XIX. THE COPLEY MEDALIST OF 1870.

XX. THE COPLEY MEDALIST OF 1871.

XXI. DEATH BY LIGHTNING.

XXII. SCIENCE AND THE 'SPIRITS'.

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VOL. II.

I. REFLECTIONS ON PRAYER AND NATURAL LAW.

II MIRACLES AND SPECIAL PROVIDENCES.

ADDITIONAL REMARKS ON MIRACLES.

III ON PRAYER AS A FORM OF PHYSICAL ENERGY.

IV. VITALITY.

V. MATTER AND FORCE.

VI. SCIENTIFIC MATERIALISM.

VII. AN ADDRESS TO STUDENTS.

VIII. SCIENTIFIC USE OF THE IMAGINATION.

IX. THE BELFAST ADDRESS.

X. APOLOGY FOR THE BELFAST ADDRESS.

XI. THE REV. JAMES MARTINEAU AND THE BELFAST ADDRESS.

XII. FERMENTATION, & ITS BEARINGS ON SURGERY & MEDICINE.

XIII. SPONTANEOUS GENERATION.

XIV. SCIENCE AND MAN.

XV. PROFESSOR VIRCHOW AND EVOLUTION.

XVI. THE ELECTRIC LIGHT.

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PREFACE TO THE SIXTH EDITION.

TO AVOID unwieldiness of bulk this edition of the 'Fragments' is
published in two volumes, instead of, as heretofore, in one.

The first volume deals almost exclusively with the laws and phenomena
of matter. The second trenches upon questions in which the phenomena
of matter interlace more or less with those of mind.

New Essays have been added, while old ones have been revised, and in
part recast. To be clear, without bein