讀此書旁行

   dú cǐ shū páng háng    讀此書旁行    ducishupanghang ‘read this book horizontally’, note in the Mòjīng giving the key to correctly reading the text, whose significance was first observed by Bì Yuán; lists of the relatively short canons were doubled up on the bamboo scrolls, requiring the reading to know to read through the top half ‘horizontally’ from right to left before continuing with the lower half.