I dare truly and boldly say, that one years exercise therein to ingenious spirits, under able Masters, will produce more real and true fruit, than the studying Aristotelian Philosophy hath brought forth in many centuries. O that the Schools therefore would leave their idle, and fruitless speculations, and not be too proud to put their hands to the coals and furnace, where they might find ocular experiments to confute their fopperies, and produce effects that would be beneficial to all posterities.

Academiarum Examen, or the Examination of Academies (1654), p. 71; of chemistry.