 Our knowledge of later Mohist thought comes from six texts, which form Books 40 through 45 of the Mozi: two books of terse “canons” (jīng 經), generally just a sentence or two in length; two of slightly longer “explanations” (jīng shuō 經說), keyed to the canons, which provide explanations of or arguments for the statements in them; the “Greater Selection” (Dà Qǔ 大取), a collection of fragments on ethics, semantics, and logic, apparently including the remnants of two or more essays; and the “Lesser Selection” (Xiǎo Qǔ 小取), which appears to be either a coherent essay or a pair of essays. (The origin of the titles “Greater Selection” and “Lesser Selection” is unknown. Possibly these were two selections, one longer and one shorter, from the remnants of damaged bamboo scrolls.) The six books as a whole are conventionally known as the Mò Biàn 墨辯, or “Mohist  Dialectics.”[2]  The Canons begin with 87 explications of or equivalence formulae for important philosophical, scientific, and mathematical terms. Some of these are in effect nominal definitions; others present substantive views. After a short, textually corrupt section, these are followed by 86 theses on a variety of subjects. 