Published in 1869, Viscount William Fitzwilliam Milton’s treatise provides a detailed, staunchly British perspective on the diplomatic stalemate over the San Juan archipelago, a territorial dispute famously ignited by the 1859 "Pig War." The text meticulously dissects the geographic and legal ambiguities of the 1846 Oregon Treaty, which vaguely established the international water boundary through the "middle of the channel" separating Vancouver Island from the mainland. Milton forcefully argues that the boundary must follow the Rosario Strait rather than the Haro Strait, a cartographic interpretation that would have permanently placed San Juan, Lopez, and Orcas islands under the British Crown. A keen insight drawn from the volume is how Milton's exhaustive legal arguments inadvertently reveal the profound anxieties driving British imperial strategy in the Pacific Northwest. By framing the retention of the archipelago not merely as a matter of territorial pride but as an absolute naval necessity to protect the sea lanes to Victoria, the book illustrates how these local island channels and ferry routes briefly became the high-stakes geopolitical linchpin for controlling the entire Puget Sound.