10. Explain the decay and deterioration of Gothic tracery.
FOR REFERENCE
"Life of John Ruskin."—Collingwood.
"Ruskin and his Circle."—Earland.
"Studies in Ruskin."—Cook.
"Witnesses of the Light."—Gladden.
"Essays in Biography and Criticism."—Bayne.
"Literary Leaders of Modern England."—Dawson.
"John Ruskin" ("English Men of Letters").—Harrison.