Book excerpt: Volume Five comprises, along with introductory comments, two "cave by cave" guides. One which, very briefly, describes the character of each cave and its patronage, is intended to be useful for the general visitor to the site. The other, very detailed, discusses the position and peculiarities of each cave in relation to the overall, year by year, development of the site. This volume also contains a complete set of cave plans, and various illuminating charts, graphs, outlines, and maps.