Description
a 'Talk-Crystal' (talc)
yellow and blue spectra with curves of maximum intensity (figures 1-3) and their combination into a solar spectrum (figures 4-5)
3) and its eggs (A and B)
British naturalist
the duty on which had been reduced by 6d
Domed Ceiling of the Basilica of San Francesco d'Assisi mb-code 42-21729307 a 'Talk-Crystal' (talc)
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