Perhaps you're having the same problem I had - the index doesn't link any of the key words to the quote, but the full quote is there in the 7th edition (is there an entry for H Pearson in the body of the 3rd edition as well?).
I finished it all without ODQ as well, so I thought it was a bit perverse when I had to use google to get the author's name (not a requirement of the puzzle) when I'd been given a source containing the quote!