Abstract
SIR E. RAY LANKESTER (NATURE, June 7) does not say what form of carbon he refers to as the colouring matter of black flints. If it be carbon, why is the coloration not extended to the white cortex? The blackest flint nodules I have seen occur in a chalk-pit near Faversham, but the apparently black silica becomes white when powdered, showing it to be merely an optical effect. I believe that Judd was the first to point this out, more than thirty years ago. I refer to the flints obtained direct from the chalk and not to those which, having become dissociated from the parent mass, have been afterwards subjected to the influence of various solutions.
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CARUS-WILSON, C. The Origin of Flint . Nature 99, 345 (1917). https://doi.org/10.1038/099345b0
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DOI: https://doi.org/10.1038/099345b0
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