with Some Comments on the Art of Horsemanship
by J. Rimmel Dunbar
I love the Google books function which shows complete scans of books out of Copyright. I search for "Side Saddle" or "Ladies Riding". Sometimes I only get a page or two of interest but it's well worth it. This measurement makes you wonder where he was measuring from! Or perhaps the proportions of ladies have changed over the past 150 years? According to that chart, I would need about a 20" seat. My Martin & Martin is 22.5" and it is none to big. OMG! Is my butt really that big?!?