Elias of Nisibis), medicine (Galen) and cosmetics (Cleopatra), in ready-reckoners (Didymus), clerk's (katib's) guides, and like handbooks, and in indirect explanations of the equivalents of measures mentioned by authors (e.g. [Please select]
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"Animal and Human Quick Reckoners" (in German), from _Proceedings of the Natural History Society at Basle_. [Please select]
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This does not mean that we became skilful reckoners. [Please select]
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