And if one objects against their false and incomprehensible suppositions that fire must be composed of very highly agitated particles because it produces such violent motion, and that a thing cannot communicate what it does not have (which is certainly a very clear and wellfounded objection), they never fail to confuse everything by some frivolous and imaginary distinction (such as that between equivocal and univocal causes) in order to appear to say something when in effect they have said nothing.