To pass the time and take their minds off the storm, the narrator begins to read to roderick. What is he reading

From the text:

The antique volume which I had taken up was the “Mad Trist” of Sir Launcelot Canning — but I had called it a favorite of Usher’s more in sad jest than in earnest; for, in truth, there is little in its uncouth and unimaginative prolixity which could have had interest for the lofty and spiritual ideality of my friend.