Helmut, That is true: "But an actual incandescent tungsten wire emits a continuous spectrum? I would say, this is a pseudo- or secondary continuity caused by blending of many discrete photons or frequencies." But Peirce was working on spectra in chemistry and astronomy long before Einstein published his 1905 paper that introduced the hypothesis of discrete photons. Since Peirce did not have acccess to a research library in his later years, he probably never read that paper. But it's likely that he may have heard or read some brief summaries about Einstein's famous 1905 papers on relativity and quantized light. John
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