French physician (1745–1826) who helped develop a more humane approach to the treatment and care of psychiatric patients. Rare ALS in French, signed “Pinel,” one page, 4.25 x 6.5, August 24. Affectionate letter to his son regarding the postponement of a trip and his wife’s health improvement, counseling him “to continue to deserve by your behavior all your father’s tenderness.” Letter is also docketed on the reverse. In very good condition, with scattered foxing and toning, intersecting folds, and a small tear to top edge. RRAuction COA.