130 APPENDIX. 



Again,, why does Zinc, a supposed element, give, with the application 

 of Backhoffner's Electro-Magnetic apparatus, two distinctly-coloured 

 points in the star of Light, one blue, the other red ? 



If it were homogeneous, it could not exhibit such phenomena, which 

 evidently imply the nature of its constituents to be compound ; and so 

 we are by analogy disposed to conclude. 







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