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The author refers to the work already done in the new map of the Solar Spectrum as enabling the chemical constitution of the Sun’s atmosphere to be studied under more favourable conditions. He shows that, the work already done enables him to confirm the presence of Sr, Pb, Cd, K, Ce and U, and also that it indicates the probability of the presence of Va, Pd, Mo, In, Li, Rb, Cs, Bi, Sn, La, Gl, Yt or Er.

III. Researches in spectrum analysis in connection with the spectrum of the sun