CENTURY I. 63 



seen in the sun : &quot; Atomus/ saith he, &quot; necessitate 

 &quot; rationis et experientiee esse convincitur ; atomum 

 &amp;lt;( enim nemo unquam vidit.&quot; And therefore the 

 tumult in the parts of solid bodies, when they are 

 compressed, which is the cause of all flight of bodies 

 through the air, and of other mechanical motions, 

 as hath been partly touched before, and shall be 

 throughly handled in due place, is not seen at all. 

 But nevertheless, if you know it not, or inquire it 

 not attentively and diligently, you shall never be 

 able to discern, and much less to produce, a number 

 of mechanical motions. Again, as to the motions 

 corporal, within the inclosures of bodies, whereby 

 the effects, which were mentioned before, pass 

 between the spirits and the tangible parts, which 

 are arefaction, colliquation, concoction, maturation, 

 &c. they are not at all handled. But they are put 

 off by the names of virtues, and natures, and actions, 

 and passions, and such other logical words. 



Experiment solitary touching the power of heat. 



99. It is certain, that of all powers in nature 

 heat is the chief; both in the frame of nature, and 

 in the works of art. Certain it is likewise, that the 

 effects of heat are most advanced, when it worketh 

 upon a body without loss or dissipation of the 

 matter ; for that ever betrayeth the account. And 

 therefore it is true, that the power of heat is best 

 perceived in distillations which are performed in 

 close vessels and receptacles. But yet there is a 

 higher degree ; for howsoever distillations do keep 



