Take a gander at this book I was looking at today: Boyer’s The compleat French-master, 1699, Folger Shakespeare Library, Call Number: 263- 520q Can you see what’s going on here? It looks at first glance like the top page has been folded back, revealing the text of the previous leaf. But that’s not it. You’re looking at the verso side of sig. H4 and nothing else. Can you see now that it’s only one leaf? Here’s an image of what this leaf looks like in other copies of this book: And now do you see what’s happened? During printing, this leaf got folded over in the press, and the inside of the fold missed the type (that’s the blank streak) and the outer part of the fold was, once unfolded, misaligned. Print the image off and fold it to see for yourself! Here’s the recto side of the leaf:…