Editing Isaac Watts (section)

=== "Element" vs. "compound" ===
{{Main|Chemical compound#History of the concept}}{{See also|Chemical element#Isaac Watts}}
In ''Logic'', Watts gave an early definition of [[chemical element]], and contrasted "element" with [[Chemical compound|chemical "compound"]] in clear, modern terms. He also provided an early list of elements then recognized by chemists—five in number—as he understood it. Watts did also, however, note the lack of consensus among chemists.<ref>{{Cite book |last=Watts |first=Isaac |url=https://archive.org/details/logickorrightuse00wattuoft/page/13/mode/1up |title=Logick: Or, the right use of reason in the enquiry after truth, with a variety of rules to guard against error in the affairs of religion and human life, as well as in the sciences |publisher=Printed for John Clark and Richard Hett |year=1726 |pages=13–15 |orig-date=1724}}</ref>