On Yuan Chwang's Travels in India, 629–645 A.D. v1.c8.s2.4

v1.c8.s2.4

Then the Yojana, he states, was divided into eight Kroṣa, the Kroṣa into 500 Bows, the Bow into four Cubits, and the Cubit into twenty-four Fingers. Forgetting, apparently, to mention the division of the Finger into three Joints Yuan-chuang proceeds to state the division of the Finger into seven Wheat (properly Barley)-grains. Thence the subdivision by sevens is carried on through the Louse, the Nit, Crevice-dust, Ox-hair [Dust], Sheep-wool [Dust], Hare-hair [Dust], Copper [Dust], Water [Dust], and Fine Dust to Extremely Fine Dust. This last is the ultimate monad of matter and is indivisible.