Query: Whose method based knowledge on experiementation, which had to be witnessed?
Context: It was founded by a group of independent scientists and given a royal charter in 1662. The Society played a large role in spreading Robert Boyle's experimental philosophy around Europe, and acted as a clearinghouse for intellectual correspondence and exchange. Boyle was "a founder of the experimental world in which scientists now live and operate," and his method based knowledge on experimentation, which had to be witnessed to provide proper empirical legitimacy.