452 Royal Society : — Mr. H. C. Sorby on some Spectra 



accord with the results of the various analyses published by other 

 chemists, none of whom mention the existence of any trace of that 

 substance. Moreover the general character of the spectrum was 

 entirely unlike that of all the known compounds of uranic oxide. 

 The various artificial salts all agree in giving a variable but small 

 number of moderately broad absorption-bands in the blue end (Nos. 

 1, 2, and 3) ; and the same is also seen in the case of several natural 

 minerals ; whereas the jargon gave a most unusually large number of 

 narrow black lines (fourteen quite distinct, besides others more faint, 

 and a single broader band which I cannot separate into lines), extend- 

 ing from the red end, so that nearly all occur in that part of the 

 spectrum which is entirely free from bands in all previously known 

 compounds of uranic oxide. This same general fact was also seen in 

 the spectrum (No. 6) of the opaque blowpipe-beads gently flamed, as 

 described in my former paper. These differences will be better un- 

 derstood by means of the following drawing, which shows three of 

 the most striking spectra of uranic salts, that of uranate of soda, and 

 the two which are rendered so abnormal by the presence of zirconia. 



Bed End. Blue End. 



D F Gt 



Spectra of Uranic Compounds. 

 Nos. 1, 2, and 3". Uranic salts of the common type, viz. 



1. Native phosphate. 



2. Nitrate in crystals. 



3. Acetate in crystals. 



No. 4. Uranate of soda in the carbonate-of-soda bead. 

 Nos. 5 and 6. Uranic compounds with zirconia, viz. : — 



5. Jargon after ignition. 



6. Crystalline borax blowpipe-bead. 



