Well, from a hypothesis. Not a theory, really, because it didn't really have a body of evidence supporting it.
Also worth pointing out, to anyone who might wonder if the ideas behind homeopathy might actually make sense -- that this was pre-germ-theory. I.e., he didn't know microorganisms existed, or that they might have something to do with illness.
Also worth pointing out, to anyone who might wonder if the ideas behind homeopathy might actually make sense -- that this was pre-germ-theory. I.e., he didn't know microorganisms existed, or that they might have something to do with illness.