"let it be remembered how variously, and how beautifully Hayley has written; though I confess his genius seems rapidly to have declined from its meridian, since that noble poem, the Essay on Epic Poetry, appeared. Of this decline I am afraid you will think, and that it will be generally thought, his late work, Epistles on Sculpture, is another proof; though it has many beauties, and though much learned information on the subject is contained in the notes. He was so good to send it to me. You will there see, or have already seen, how passionately he deplores his lost protegé; and that he there gives him his own name, confirming the public surmise that he was his son; but if it really was so, he either chose to deceive me on the subject, or I strangely misunderstood him, when I was his guest at Eartham, in the summer 1782, when this youth was an infant, not two years old, an whose real father I understood to be the gallant young Howel, a former adoption of My Hayley’s who was lost on his return from the West Indies."
"Letters of Anna Seward: Written Between the Years 1784 and 1807", vol 5 pp: 321-22