ON WAVE-LENGTH TABLES OF THE SPECTRA OF THE ELEMENTS. 427 



Nickel. 



• Observeil also by Leeoq ilc Boisbaudran in the Spark Spectrum of Nickel Chloriilc solution, a.- a!~o 

 the following lines :— 6315, 6261, 5827, 5801. 575C, 5716, 5695,5665, 5641 (double), 5621, 5609, 5588, 512!), 

 5648, 4998, 49511, 4808, 4762, 4732, 4606, 4594, 4571, 4550, 4471, 4461, 4327. 1288. 



t Observed also by Lockver; the 'indices' attached to these numbers denote the comparative 

 ' lengths' of the lines. J 5891-9 Thollou. 



b. See Iron ; the Fraunhofcr line b, is double. 



