Ezra Stiles: Watts was an Arian on the Divinity of Christ

That's what Ezra Stiles asserted about Isaac Watts here. Quote:

When Dr Watts set out in Life he was clearly a Calvinist ...When the Arian Controversy got hold of the Dissenters in the public cause of the Rev. Mr. Pierce of Exeter about 1720: Dr Watts entered the Arian Researches, became plunged as to the real Divinity of J. C, as appears in the follow[ing] Publications of the last 20 years of his Life. But tho' he was an Arian on the Divinity of Christ, yet he never relinquished any of the other evangelical Doctrines, the real vicarious Satisfaction even plenary Atonem[ent], with Justific[ation] by Christs Righteousness &c.—One may perceive the same Thing in Seeds Sermons. The Ruin & Reco[very] retains the Deriv[ation] of Guilt & Corruption from Adam—& this is the Augustinian Notion of Original Sin. Dr Langdon's Plunges have a pretty extensive influence into his whole Theology.