Abstract
MAY I query Mr. Carus-Wilson's opinions in his letter in NATURE of June 23 (p. 523)? I have, alas! seen only one case (at Ilkley) of these markings, but have long been interested in the peculiar weathering of mortar which is common on the north side of old buildings near the sea. My view is that it is quite distinct from the cup and rings. The change in mortar is, I suspect, one of adsorptive precipitation, so well explained by Mr. S. C. Bradford in NATURE of March 23, 1916, and elsewhere.
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ABBOTT, G. Cup and Ring Markings. Nature 107, 652 (1921). https://doi.org/10.1038/107652a0
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DOI: https://doi.org/10.1038/107652a0
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