Testatrix devised the residue of her estate to Rev. Wells (D) 'to distribute same in such manner as in his discretion shall appear best calculated to carry out wishes which I have expressed to him or may express to him.' Testatrix's heirs (P) sued, claiming that the devise was invalid, and the residue should be distributed to them. D responded by claiming that Testatrix had intended that the devise be used for charitable purposes and that he was willing to affect these purposes.