 The core of later Mohist epistemology is presented in two places, a group of canons describing basic cognitive functions (A3–6) and another canon listing sources and types of knowledge (A80). It is not entirely clear how, or whether, the doctrines presented in the two places fit together as a system. (The texts make no attempt to link the two, and Canon A80 treats aspects of knowledge that do not mesh directly with the account in A3–A6.) But they do give a reasonably informative picture of the later Mohists’ approach to knowledge. 