Interesting phases of the process of carrying to the sea the vast quantity of debris thrown out by a great volcanic eruption are shown by the history of the gorges of the Wallibu and Rabaka rivers, Saint Vincent, British West Indies, since May 7, 1902, when the volcano known as the Soufrière suddenly resumed violent activity. Practically the entire catchment basins of these streams were affected by the eruptions. The northern half of each lies upon the southern slopes of the volcano, and therefore felt the full force of the avalanches of débris and the blasts accompanying the rolling clouds of dust-laden steam. On these slopes the vegetation, including the big forest trees with few exceptions, was completely destroyed or swept away, together with most of the soil, and a deposit some meters thick of new ash was laid down on the ridges, while thicker accumulations formed in the . . .