FE VII. 



Note to Article XXXIII, on The New Spectrum. — The portion of 

 the energy curve in the plate immediately above the visible spectrum 

 is given erroneously, through an oversight of the author's discovered 

 too late for correction in the present number. The reader may sup- 

 pose this part of the curve to be omitted, as it will be in subsequent 

 plates. 





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