----- 阿伏加德罗和道尔顿
At the outset of this essay, it is well to state an axiom which is much used in the course of the argument. It is assumed that there is an essential distinction between what are known on the one hand as laws and on the other hand as hypotheses. A hypothesis is the creation of the mind, and is of service in interpreting a law. There is good ground for the belief that in science the recognition of this distinction. Between law and hypothesis is an indispensable condition of. Clear thinking.
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