John Ruskin letter to Ellen Heaton, 1855 mid-February?

Ruskin writes that he cannot advise Heaton on matters of framing, as he has "never yet framed a picture to [his] liking." He offers further praise of Turner's Walls of Rome. He advises against the purchase of his "Venice folios." He concludes: "I am sorry to say I mean't & mean what I say of art to separate it from other pursuits. Music helps religious feelings in thousands. Politics ... are a part of Religion. Pictorial art is too often separated from it -- or opposed to it." [Date provided by Surtees: ? Mid-February 1855]