Rowbotham wrote: "The term Zetetic is derived from the Greek verb Zeteo; which
means to search, or examine; to proceed only by inquiry; to take
nothing for granted, but to trace phenomena to their immediate and
demonstrable causes. It is here used in contradistinction from the word
"theoretic," the meaning of which is, speculative--imaginary--not
tangible,--scheming, but not proving."
While you are explaining what he meant, put in your thoughts about his
methods. What does he do with observations that is different from the
theoretical scientists that he disagrees with.