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(Gifford, F. W. R., u. Slienstone, W., A.,) Optical properties of vitreous 



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 Glazebrook , R. T., Note on the diffraction theorj^ of the microseope as 



applied to the case whcn the object is in motion (Proc. Phys. Soc. 



1904, p. 1G2; vgl. Journ. Microsc. Soc. 1904, pt. 3, p. 3G1 ; Nature LXX, 

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 (Legros, V.,) Photogrammetrisches Fokouieter für die mikroskopische Optik 



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 Lyman, T., The Prolongation of spectral lines (Proc. Americ. Acad. of Arts 



and Sciences 1903, vol. XXXIX, no. 2, p. 33). 

 Lyniau , T., Explanation of false spectra from diifraction gratings (Proc. 



Americ. Acad. of Arts and Sciences 1903, vol. XXXIX, no. 3, p. 39). 

 Mace de Lepiuay, J. , et BiiLsson , H. , Sur une nouvelle methode de 



mesure des epaisseurs et des indices de lames ä faces paralleles (Ann. 



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 Meslin, G., Sur la compensation des interferences et la mesure des petites 



epaisseurs (Compt. Rend. Acad. de Paris T. CXXXVIII, 1904, p. 957). 

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light of wave-lengths from 250 ^ to 100 ,u (Journ. R. Microsc. Soc. 



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8* 



