C. E. WALLIS "FATHER" OF LONDON'S SCHOOL DENTAL SERVICE CHARLES EDWARD WALLIS was born in Lambeth on 25 March 1869, son of Fanny and Augustus Wallis; his father was an insurance clerk.' Wallis was educated at Bedford Grammar School and King's College Hospital, which was then sited in Portugal Street near the Strand.2 It was there that he gained the conjoint medical diploma in 1894. Following on...

This paper analyzes collective choices in a society with strategic voters and single-crossing preferences. It shows that, in addition to single-peakedness, single-crossingness is another meaningful domain which guarantees the existence of non-manipulable social choice functions. A social choice function is shown to be anonymous, unanimous and strategy-proof on single-crossing domains if and onl...