وهي إما تصورية أي حدود تورد لموضوع الصناعة وأجزائه وجزئياته وأعراضه الذاتية
Principles may be conceptual: definitions of the science's subject, its parts, kinds, and proper attributes.
One must know what the relevant terms mean before judging propositions about them. If “proposition” and “syllogism” are not defined, the purported rules concerning them lack a fixed subject.
Conceptual principles clarify meaning and delimitation; merely giving such a definition is not yet the proof of a new declarative thesis.