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如果这一极重要的自然规律,元素周期律,竟至今还没有被发现的话,我们试想一下,我们的化学和学将成为一种什么样的情况?那将是许许多多的孤立的琐碎的事实的堆集,没有一点系统,新的事实无法预见,实验的结果也难于确定其是否正确;总之,是一种混乱的状态。这对於学习、研究以及运用化学知识法解决生产技术的人们,将造成何等大的困难,而另一方面,我们也无法想像整个自然科学能达到像今天这样发展的高度。因此,这一具有极其重大的基础性的定律的发现在历史上成为科学发展的里程碑。在它发现以前和发现以後,化学史分成了截然不同的两个时代。
If this very important law of nature, the law of the periodicity of the elements, has so far not been discovered, let us imagine what our chemistry and learning will be like? That will be a multitude of isolated and trivial The accumulation of facts, without any system, can not be foreseen by new facts, and the results of experiments are difficult to determine if they are correct; in short, it is a state of chaos. This will pose great difficulties for those who study, research and solve the production technology by applying the method of chemical knowledge. On the other hand, we can not imagine that the entire natural science can achieve such a level of development as it is today. Therefore, the discovery of this extremely fundamental law of nature has historically been a milestone in the development of science. Before and after its discovery, the history of chemistry was divided into two distinct periods.