Buy it! This a great Darwin book. His rarest, apparently, and recently republished by Daniel Wexler's efforts.
Can't wait for Darwin's "Golf Courses of Great Britain" (1925) to be reprinted next year. It's different from "Golf Courses of the British Isles" (1908?) and sheds a lot of light on the "Golden Age" courses and architects.
Interestingly, I recently read an article that was criticising the "cult of the golden age architect". One of the arguments was that Darwin never refers to architects in his first book 1908(?) book. This is true, but there's a marked difference in the 1925 update and it shows the impact that those guys were making during that important period of about 1910-1925.