The important thing to remember is the date at which things happened and whether it was the British Raj (in India), the rest of the Empire or a foreign country. There were no such things as High Commissions until fairly recently with the creation of the Commonwealth. India was unique with a Viceroy standing in for the Queen and actually issuing its own passports (British Indian), with all its business being done through the India Office, but with the Princely States having differences in administration. Dominions (South Africa, Canada, Australia and New Zealand) were fully independent from varying dates, Colonies, Crown Colonies, Protectorates, Self-Governing Colonies were administered through the Colonial Office and Mandates through the Foreign Office. Consulates existed as branch offices in foreign countries which were important enough to have a full Embassy and in foreign countries which were not important enough to have an Embassy at all - but there would be no point looking for either a High Commission in India in 1865 for the simple reason no such thing existed - or a consulate as it was not a foreign country.