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Ideas of Dmitri Mendeleev, by Text

[Russian, 1834 - 1907, Professor of Chemistry at St Petersburg University.]

1870 The Principles of Chemistry
p.118 Mendeleev saw three principles in nature: matter, force and spirit (where the latter seems to be essence)
p.118 Mendeleev had a view of elements which allowed him to overlook some conflicting observations
p.118 Mendeleev focused on abstract elements, not simple substances, so he got to their essence
I:23 p.115 Elements don't survive in compounds, but the 'substance' of the element does