Sentence:  Mons. Lemery is of Opinion that Sweetness proceeds from a close Mixture of an Acid with a Sulphur, or with an Oyl that temperates and corrects it; he supports his Conjecture by the instance of <WSD>Sugar</WSD> of Saturn, so called from its Sweetness, which is Lead, a Metal insipid in its self, but very Sulphureous, dissolved by an Acid. 
Meaning of the word marked with <WSD> tags:  Anything resembling sugar in taste or appearance, especially in chemistry.