Next month, a fourth installment, “The Passage of Power,” will appear 10 years after the last, “Master of the Senate,” which came out 12 years after its predecessor, “Means of Ascent,” which in turn was published 8 years after the first book, “The Path to Power.” These are not ordinary-size volumes, either. “Means of Ascent,” at 500 pages or so, is the comparative shrimp of the bunch. “The Path to Power” is almost 900 pages long; “Master of the Senate” is close to 1,200, or nearly as long as the previous two combined. If you try to read or reread them all in just a couple weeks, as I foolishly did not long ago, you find yourself reluctant to put them down but also worried that your eyeballs may fall out.