MR. CHARLES DK WATTWI.LK >N KLAMK SI'KCTHA. 



159 



LEAD. 

 Salt used : Lead Nitrate. 



BISMUTH. 

 Salt used: Bismuth Sub-Nitrate dissolved with dilute Nitric Acid. 



* It is pmltablc that the spectrum of bismuth, which is very feeble compared with those of the other 

 metals, would le improved if photographed under different conditions, r.g., if a different salt were used 

 and the time of exposure were prolonged. 



