In addition to these books he wrote on Lagrange 's method and Monge 's method for solving partial differential equations and, jointly with Galton, he wrote On the probability of extinction of families.
Bilang karagdagan sa mga librong ito siya wrote on Lagrange 's paraan at Monge' s paraan para sa solving bahagyang kaugalian at equation, sama-sama sa Galton, he wrote on ang probabilidad ng pagpatay ng mga pamilya.