Antony Adler's paper examines how an attention to the history of science can help us better understand the making of a "Pacific World" during the early twentieth century. He argues that the rhetoric of science, in conjunction with internationalist movements of the interwar period, played a crucial role in shaping how the Pacific was imagined and described by inhabitants of the Pacific region and by scientists who sought to conduct systematic, large-scale, research in the Pacific basin. This paper argues that science helped cement a view of the Pacific region as a unified "world."