PHYSICS. 213 



THALEN, R. Le Spectre d Absorption de la Vapeur d lode. 



Vol. I., Pamphlets. Quarto series. 



4to. 12 pp., IV. plates. Upsal, 1809. 



THOMPSON, Thomas. An Outline of the Sciences of Heat and 

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TYNDALL, John. Notes of a Course of Nine Lectures on Light. 



Svo. 74 pp. London, 1870. 

 WARREN, C. M. On a Process of Fractional Condensation. 



4to. 13 pp. 

 WIGHAM, J. R. A New Method of Illuminating Lighthouses. 



Svo. 8 pp. Dublin, 1865. 



WILCOCKS, A. Thoughts on the Influence of Ether in the Solar 

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YOUMANS, E. L. The Correlation and Conservation of Forces. 



8vo. 438 pp. New- York, 1865. 



SPECTRUM ANALYSIS : Brewster and Gladstone ; Kirchoff, G. ; Ros 

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