December 6th, 1860 Frances wrote to Caroline Dent: "I have been enabled in the last fortnight to explain every one of the figures in the Dendera Zodiac and Planisphere, over which I had been puzzling in vain for the last thirty years. . . . I am now quite encouraged by this remarkable proof that my faculties are not injured, on the contrary, though for a much shorter time can I exercise them--two hours and it used to be six, but I am thankful, and have long prayed to do much in a little time."
Frances' copy of the planisphere was given to her by William Hone, and lately mounted for her on calico by a young American friend. She would be sending a tracing of the planisphere to the printer Rivington as a lithograph frontispiece or map for her life's work, Mazzaroth: The Constellations.