196 SEC. 7. LIGHT. 



912e. Prisms with Compartments. M. Lutz, Paris. 



912 f. Bi-refr acting Spar Prisms. M. Lutz, Paris. 



912g. Rhomboids of Spar. M. Lutz, Paris. 



912h. Collection of 12 Nicol Prisms. M. Lutz, Paris. 



912i. Four Large Nicol Prisms. M. Lutz, Paris. 



912j. Prisms for M. Desain's Experiments. 



M. Lutz, Paris. 



912k. Uranium Glass Prisms. M. Lutz, Paris. 



9121. Uranium Glass Cube. M. Lutz, Paris. 



912m. Three Quartz Prisms. M. Lutz, Paris. 



912n. Six Prisms for Spectroscope (direct light). 



M. Lutz, Paris. 



912o. Six Prisms for Spectroscope (direct light). 



M. Lutz, Paris. 



912p. Two Pyramidal Prisms. M. Lutz, Paris. 



912q. Three Flagon Prisms. M. Lutz, Paris. 



91 2r. Four Poly Prisms. M. Lutz, Paris. 



912s. Four Prisms for Bisulphide of Carbon. 



M. Lutz, Paris. 



912t. Two Isosceles Prisms of Flint Glass. 



M. Lutz, Paris. 



91 2u. Three Foucault's Prisms. M. Lutz, Paris. 



91 2 v. Two De Senamont's Prisms. M. Lutz, Paris. 



912w. Three Braszinowski and Hartnack's Prisms. 



M. Lutz, Paris. 



912x. Six Rochon's Prisms. M. Lutz, Paris. 



912y. Boit's Prism. M. Lutz, Paris. 



912z. Large Flint Glass Prism, extra denticulated, set in 

 a peculiar manner. M. Lutz, Paris. 



913. Instrument to show the phenomenon of conical re- 

 fraction, with models of Fresnel's wave surface. (Soleil, Paris.) 



//. Lloyd, Trinity College, Dublin. 



