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Definite economic problems can very rarely be dealt with by merely quantitative methods.
The elementary use of graphic methods is qualitative rather than quantitative; i.e.
Lavoisier may be justly regarded as the founder of modern or quantitative chemistry.
The researches of Julius Thomsen and others have shown that in many cases definite conclusions regarding constitution can be drawn from quantitative measurements of the heats of combustion; and in this article a summary of the chief results will be given.
The conclusion that each element had a definite atomic weight, peculiar to it, was the new idea that made his speculations fruitful, because it allowed of quantitative deduction and verification.