 Sturm’s last physics, the Compendium Physicae Modernae Sanioris (CPMS), makes particularly clear that hypotheses have a place in between observations by the senses and certainties revealed by the demonstrative method. He points out that some things are obvious, in that they are observed by the senses or by means of experiments including the use of newly invented instruments (CPMS: 2f). Some things are merely conjectured rather than infallibly demonstrated (supponuntur verius &amp; conjiciuntur, quam infallibiliter demonstratur) (CPMS: 3). Some are certain, in the sense that phenomena and hypotheses align, that is, they are 