The general knowledge that certain liquids vaporize at lower temperatures than others, and that the melting-points of metals differ greatly, for example, was just as necessary to alchemy as to chemistry.
(The general knowledge; vaporize; L:at lower temperatures than others) (the melting-points of metals; differ greatly; ) (The general knowledge that certain liquids vaporize at lower temperatures than others; was; just as necessary to alchemy as to chemistry)
The general knowledge the melting-points of metals The general knowledge that certain liquids vaporize at lower temperatures than others
vaporize differ greatly was
L:at lower temperatures than others
just as necessary to alchemy as to chemistry