[1] On the death of Ernest Hawkins in 1865, Bullock succeeded him as chief secretary of the SPG, a post he held for the rest of his life.
He saw 42 new sees added to the colonial episcopate, while church operations were extended beyond the British Empire, by the appointment of missionary bishops in the Niger territory, Honolulu, Ningbo, Madagascar, Central Africa, and Melanesia.
[1] In 1878 Bullock took part in the arrangements for the Pan-Anglican synod, but at the end of the year his health forced him take leave.
[1] Bullock was the author of about 70 articles in Smith's Dictionary of the Bible, and wrote on the Book of Ecclesiastes in the Speaker's Commentary.
After his death a volume of sermons, edited by his widow, was published, most of them preached at Kensington Palace Chapel.