"I had seen a copy of Pre-Raphaelitism in the library"

Pre-Raphaelitism  was a book of art criticism by John Ruskin, first published in 1851. 

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This 1865 edition does not appear to contain a discussion of The Awakening Conscience, although Ruskin is said to have written a letter to The Times defending the painting and commenting, there is not a single object in all that room but it becomes tragical if read rightly. 

Possibly, other editions were published with additional material. 

Ruskin is also said to have praised Holman Hunt for creating a narrative for his painting from his imagination rather than relying on some pre-established story.