SUPPLEMENT. 



As the omission of the authors' names in connection with references to the 

 J;ihresberichte de»- Cheinie has been pointed out as a serious defect in the Index, 

 these names arc now supplied below. 



Jahresber. d. Cheraie (1847-8), 161, analysis, by Draper. 



(1847-'8), 164, analysis, by Becquerel. 

 " (1847-8), 197, analysis, by Brewster. 

 (1847-'8), 197, analysis, by Airy. 

 (1847-'8), 198, analysis, by Melloni. 

 (1847-8), 198, analysis, by Brewster. 



" (1847-8), 221, chlorine and hydrogen, by Favre 

 and Silbermann. 

 (1849), 164, photography of, by Becquerel. 

 " (1850), 154, lines in the sp., by Brewster. 



(1851), 151, longitudinal lines, by Ragona-Scina. 

 (1851), 134; (1852), 117, interference sp., both by 



Nobert. 

 (1851), 152, Fraunhofer lines, by Broch. 

 (1851), 152, electric sp., by Masson. 



(1852), 124, Fraunhofer lines, by Phillips and by 



Merz. 

 (1852), 125, analysis, by Stokes. 

 " (1852), 125, longitudinal lines, by Zantedeschi. 

 (1852), 126, measurements of the sp., by Porro. 

 (1852), 126, 131, analysis, by Helmholtz. 

 (1853), 167, Fraunhofer lines, by Kuhn. 

 (1853), 167, Longitudinal lines, by Salm-Horstmar. 

 (1853), 178, colors, by Grassmann. 

 (1854), 137, Fraunhofer lines, by Heusser. 

 (1854), 197, solar sp. in general, by Becquerel. 

 (1855), 123, analysis, by Helmholtz. 

 (1855), 123, lines of the sp., by Grassmann. 



(395) 



