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The publication starts with the language of crystal orbitals, band buildings and densities of states. The instruments for relocating again from the hugely delocalized orbitals of the forged are then equipped up in a clear demeanour; they contain decompositions of the densities of states and crystal orbital overlap populations.
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We can separate them again by using aqua fortis (concentrated nitric acid). Fire analysis gives us absolutely no basis to argue that gold is composed of four, or three, or for that matter of any other number of elements greater than one. Blood, in contrast, appears to give ﬁve products of analysis: phlegm, spirit, oil, salt, and earth. Are these ﬁve substances elementary? By means of such arguments, Boyle arrived at the conclusion that we have no good reason to adopt any element theory that claims there are universal elements present in all bodies.
Robert Boyle that has led some historians to characterize Boyle’s avocation as “chymistry,” to distinguish it from what came before and after. I shall continue to use the spelling “chemistry” and the words chemistry and alchemy. It is, however, important to realize that Boyle’s chemistry is very different from that of the late eighteenth century, just as that chemistry is very different from today’s. The idea that alchemy involved metallic transformation while chemistry had other goals was not widely accepted until the very end of the seventeenth century.
If water was the source of the growth of the sapling and of the resulting increase in its weight, then there was no need to grow the plant in earth. So Boyle grew seedlings in water and conﬁrmed that they increased in weight. He would not, however, accept water as the universal element. Since Van Helmont had speciﬁed that “elementary” water contained its own sulfur and mercury, he was not arguing for water as an element in the purest sense. In any case, Van Helmont’s theory, like all the other element theories that Boyle *Boyle quoted in W.