A Preliminary Dissertation on the Mechanisms of the Heavens, by Mary S 67386 [Full title: A Preliminary Dissertation on the Mechanisms of the Heavens] [Full author's name: Mary Somerville] [Author: Mary Somerville] [Link: https://www.gutenberg.org/6/7/3/8/67386] [Files: 67386-0.txt; 67386-h.htm] Thanks to Laura Natal Rodrigues (Images generously made available by Hathi Trust Digital Library.) Regards, Al