A history of science . e air exerts force in the at-tempt to regain its normal bulk. But, he argues,surely we are not to believe that the particles of airexpand to fill all the space when the bulk of air as awhole expands under the influence of heat; nor can weconceive that the particles of normal air are in actualcontact, else we should not be able to compress the his conclusion, which, as we have seen, he makesgeneral in its application to all matter, that there arespaces, or, as he calls them, vacua, between the par-ticles that go to make up all substances, whetherliquid, solid, o


A history of science . e air exerts force in the at-tempt to regain its normal bulk. But, he argues,surely we are not to believe that the particles of airexpand to fill all the space when the bulk of air as awhole expands under the influence of heat; nor can weconceive that the particles of normal air are in actualcontact, else we should not be able to compress the his conclusion, which, as we have seen, he makesgeneral in its application to all matter, that there arespaces, or, as he calls them, vacua, between the par-ticles that go to make up all substances, whetherliquid, solid, or gaseous. Here, clearly enough, was the idea of the atomicnature of matter accepted as a fundamental argumentative attitude asstmied by Hero showsthat the doctrine could not be expected to go un-challenged. But, on the other hand, there is nothingin his phrasing to suggest an intention to claim orig-inality for any phase of the doctrine. We may inferthat in the three hundred years that had elapsed since 246.


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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1904