Did Thomson Write the Poem to the Memory of Mr. Congreve?

Extract

In 1843 Peter Cunningham included in a collection of verse printed for the Percy Society an anonymous poem in blank verse, To the Memory of Mr. Congreve, whose authorship Cunningham, at the suggestion of H. J. Cary, ascribed to James Thomson. This ascription was made on the following grounds: that the style of the poem was Thomson's; that the poem was originally printed in 1729 by J. Millan, who was the publisher of Thomson's Winter, Summer, To the Memory of Sir Isaac Newton, and Brittania; and that “these poems by Thomson are advertised among Millan's books, and at the head of his list at the end of this very publication.”