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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-NiagaraThe Parallel Roads of Glen Roy-Alpine Sculpture-Recent Experiments on FogSignals-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 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 Materialism-An Address to Students-Scientific Use of the Imagination-The Belfast Address-Apology for the Belfast Address-The Rev. 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