Third child and second son of William Blackstock, gentleman, and Kate Anthony, his wife, he was born at 3 Cole Street, Birkenhead on 13 January 1895. He was educated at the Liverpool Collegiate High School and at King's College Hospital, London, where he was house physician, children's house physici

Horace Braithwaite Bullen graduated with first class honours in the Natural Science Tripos at Cambridge in 1913. He did his medical training at Cambridge and at St Bartholomew's Hospital where he became house surgeon. He won the Walsham Prize in 1917 and the Bentley Prize in 1918. He was temporary S