I also found the book in Google Books, but it only provided snippets for some of the pages referred to below. (I searched "Rachel Ball" and "Ball".
Page 42 appears to be an index, under Merry, Cornelius, it lists "Rahael (Ball) 68"
Page 68: "We also call attention to the name Rachael Ballard. The Springfield. Massachusetts Library has photostats of the Northampton Town Marriage Records, and here the name is shown to have been Rachaell Ball." There might be more information, but the snippet ends there.
Page 132. "Cornelius Merry was a servant of John Lyman, to whom he was indentured. He purchased a number of acres of land, and in 1663, married Rachel Ball. They had seven children..."
Page 324 also appears to be an index: "BALL, Rachael, ca. (1635) 1-1-1"