It is always an unsatisfactory task to attempt to summarize the results of an extensive piece of scientific work while this is still in progress. The conclusions made during the course of a series of researches are necessarily tentative ones, and subject to more or less modification when the work comes to an end. Even the main facts elicited during the investigation do not at the time present themselves in their real proportions. One fails to appreciate the importance of some, and may be tempted to give emphasis to others which do not possess the significance assigned to them. Such considerations apply with special force to the following sketch of the main results apparent so far from the work of the International Fishery Investigations in the Northern European seas. Nine countries—Britain, Belgium, Denmark, Germany, Finland, The Netherlands, Norway, Russia, and Sweden—are engaged in these researches. Each country has its own staff of scientific men (and women); its own exploring vessels and laboratories; and its own publications. Controlling and supervising all this work is the International Council, operating through the Bureau at Copenhagen, and the Central Laboratory at Christiania.