This series contains extracts from volumes in C.O. 537 series [supplementary correspondence]. The records consist mainly of despatches to and from the Secretary of State for the Colonies and the Governor-General of Canada and senior British military officers. The majority of the records were originally classified as "Secret" or "Confidential." Records pertain to all parts of Canada, but include substantial British Columbia-related material. San Juan Island dispute, B.C.'s entry into Confederation, trans-Pacific steamship services, coastal defence, and the Bering Sea sealing negotiations are but some of the issues documented in this series.