The 19th century was a wild time. Everything was a science back then. That's why communists speak of the "immortal science of Marxist-Leninism." Marx literally said he was performing science, but that wasn't seen as an absurdity because that is how everyone spoke.

It wasn't until the mid-20th century when people started to get more serious about defining science. Philosophers started critiquing it in the early 20th century like the Vienna Circle and Popper, and eventually the definition of what constitutes science was narrowed down to one that was defined as a particular sort of empiricism.

That, too, has its own problems.

Feyerabend: the only rule is "anything goes"