Slip 8.2b2 - But whether it makes sense to include the time constraint in this way in the definition of the term is very much a question. Anyway, you can these necessary ness not from the special nature of the subject field of sociology deduce how Freyer says. And it then sets the term from quite heterogeneous inventory of which that of the time constraint share together, never clearly grasped (? From 1750 to 1849) and will never be experimentally controlled.
A detailed criticism of Freyer’s very prescriptive teaching would probably go too far.