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Amplifying what Yan has discovered for us, the invaluable Wikipedia tells us that "Borax was first discovered in dry lake beds in Tibet and was imported via the Silk Road <https://en.wikipedia.org/wiki/Silk_Road> to Arabia.^[6] <https://en.wikipedia.org/wiki/Borax#cite_note-amoz-6> Borax first came into common use in the late 19th century . . . ." So it would seem that Kipling had Purun Dass meet an early 'road train'. /Alastair Wilson/