 This criticism from Hobbes, and Boyle’s rebuttals relying upon evidence from experiments, could be seen as a conflict of Boyle’s experimental natural philosophy against a form of speculative natural  philosophy.[9]  However, it is important to avoid taking Hobbes’ criticisms of Boyle’s method to imply that Hobbes completely eschewed experiment/experience while engaging in natural-philosophical explanations. Instead, Hobbes viewed experiment/experience as playing the role of establishing that some phenomenon occurs, what we have seen he called the ‘that’, but one should never hope, according to Hobbes, to glean a possible cause from mere observations, even if those observations were carefully documented and repeated many times.