I was really quite disappointed in this book. The text was inspired, verging often almost on the insipid. And the prints, of course, were all in black/white and so were worthless. In earlier portions of the book, I went from reading to using his selections as a guide (via internet) for thinking about the sequence of his thoughts -- and then eventually, just used Wikipaintings to go through chronologically the artists he discussed. Clark's book itself became irrelevant.
I think the problem was that he spent a lot of time talking about landscape in paintings where the landscape was not the primary focus of the work -- everything up to and prior to Titian's Tempesto falls into this category. As such, there was no real handle for analysis. He was like a man on a train saying: "Oh, look!"
A missed opportunity.
(P.S. 3-stars in my book means "didn't like it". Sorry GR..., I don't follow guidelines...)
(What I have is billed on the cover as the "revised edition". First published in 1949, a New Edition was published in 1976, issued as a paperback in 1979, and subsequently reprinted. I adore landscapes, having never set foot out of a jagged urban or inner suburban setting (barely) in my life..., and so look forward to reading this. For me, looking at Poussin or Corot is becoming like a form of prayer...)