He was promoted to Staff Surgeon on 16 May 1902, and joined "H.M.S Ariadne", the Flagship of the North American and West Indies Squadron. While on the "Ariadne" he saw service in the Venezuelan crisis of 1902–1903 The ship was paid off on 11 August 1905, and Jeans privately printed his "Ward-room diary H.M.S. "Ariadne" 1902-1905" in 1905. Jeans attended a hospital training course for the last quarter of 1905.