The son of John Bradford Jarvis, an insurance clerk, and his wife, Mary Harvey, he joined the merchant navy in 1896, then volunteered for British imperial service in the
Second Boer War in 1899. Following his return from the war, he was in April 1902 appointed a
second lieutenant in the
3rd (Dorset Militia) Battalion, Dorset Regiment. He married Mabel Jane Hodson, daughter of a member of the US embassy staff in London, in 1903. They had one daughter. Jarvis then combined part-time military service in Ireland with freelance journalism until the
First World War broke out. Jarvis's interest in
Arabs and the
Arabic language grew from wartime army service in
Palestine and
Egypt, then a British
protectorate. He was seconded to the new Egyptian frontiers administration by the British high commissioner, Sir
Reginald Wingate, serving first in the Western desert and then in
Sinai. His Arabic and knowledge of Bedouin customs allowed him as governor of Sinai from 1923 to intercede successfully in local disputes and to clamp down on banditry and drug trafficking. He also traced the remains of a Roman and Byzantine settlement in northern Sinai, and by damming the local
Wadi Gedeirat and restoring the stone channels succeeded in recreating an oasis. He wrote of governance in Western Egypt: The Coastguards had policed the Western Desert and Red Sea District; and the [Ministry of the] Interior had functioned in the oases of
Kharga,
Dakhla,
Bahariya, and
Farafra; whilst the Ministries of Justice, Finance, Health, Education, etc., had all supplied officials to perform their various duties. In 1933, Governor of Sinai Jarvis was appointed an
Officer of the Order of the British Empire. The King of Egypt had early in 1931 awarded him with the Insignia of the Third Class of the
Order of the Nile. Jarvis took early retirement in 1936 and was appointed a
Companion of the Order of St Michael and St George (CMG). He then devoted himself to natural history, writing and farming. He joined the staff of the magazine
Country Life in 1939, contributing a column, ''A Countryman's Notes
, for 14 years. He was awarded the Lawrence Medal by the Royal Central Asian Society in 1938. In 1938, in an article for the Palestine Exploration Quarterly'', Jarvis proposed
Mount Helal as the
biblical Mount Sinai. He died at his Ringwood home, Chele Orchard, on 8 December 1953. ==Partial bibliography==