The sales of the "Grammar," "Exercises," "Key," and "Lecteur Francais" brought Murray in each case £700, and he devoted the whole sum to philanthropic objects. The copyright of his religious works he presented to his publishers. By his will, a sum of money for the purchase and distribution of religious literature was vested in trustees in America. When the Retreat for the Insane was founded at York by William Tuke in 1792, Murray did his utmost to second Tuke's efforts to introduce a humane system of treatment.