I just collated all the illustrations. For the first time ever, I've used a numbering system that breaks them down relative to each chapter, or in this case, part (since the book is composed of two parts). That's because there are so many of them: twenty two I think. So as per the Minnesota manual, I've been numbering them 1.2, 1.3, 2.5 and so on.
There is an interstitial image without text, that works well as a frontispiece to part 2. I'm calling that one 2.0, although if my wonderful editor has other ideas, I'm all ears.