A前言 在天文学及物理学中的原子论,研究的对象大都不是我们普通所谓能直接经验的东西。量一星与另一星的距离,说它是几亿几兆英里,所量者不过是天文台或试验中的现象,或举动,或事实。原子论的情形一样,说电子的半径等於2×10-13生的,从试验方面的证实着想,也不过是形容试验室? A Introduction Atomic theory in astronomy and physics, the object of study are not what we ordinary so-called direct experience. Measuring the distance between a star and another star, saying that it is hundreds of millions of millions of miles, the quantity is nothing more than a phenomenon, action, or fact in an observatory or experiment. The same as the case of atomic theory, that the electron radius equal to 2 × 10-13 students, from the experimental proof of the sake, but also describe the laboratory?