Under Scott's naval regime the hut was divided by a wall made of packing cases, so that officers and men lived largely separate existences, scientists being deemed "officers" for this purpose.[68] Everybody was kept busy; scientific work continued, observations and measurements were taken, equipment was overhauled and adapted for future journeys. The surviving ponies needed daily exercise, and the dogs required regular attention.[69] Scott spent much time calculating sledging rations and weights for the forthcoming polar march.[70] The routine included regular lectures on a wide range of subjects: Ponting on Japan, Wilson on sketching, Oates on horse management and geologist Debenham on volcanoes.[69][71]