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As full details as possible have been given of the methods of working with the various types of instruments. In the many branches of Applied Spectroscopy, as distinct from the statistical work, it has been quite impossible to deal with the great number of researches of the present time. Typical investigations have, therefore, been selected, both with the view of indicating the lines upon which present work is being carried on, and, further, in the hope, which I trust is not a vain one, that more workers may be encouraged to enter this fascinating and prolific field of research.