Cook then sailed for Otaheite, which he reached in April. The contrast of the luxurious climate with the inclement region which they had left behind them, was doubly striking to men who, for upwards of half a year, had seen nothing but the ocean or the deserts of Cape Horn. They now proceeded vigorously to the chief purposes of their voyage. The captain and his officers prepared their instruments to observe the transit, while Banks and his botanical attendants ranged the island, made themselves acquainted with its natural productions, and conciliated the natives. The effect of his intelligence and intrepidity was conspicuous on an occasion which might have involved the scientific fate of the expedition. The quadrant, though under charge of a sentinel, had been stolen by the adroitness of some of the natives. But without it no observation could be taken. Banks volunteered to go in search of it into the woods, made himself master of it, and conveyed it in safety to the observatory; though followed by parties of the natives, and occasionally compelled to keep them at bay by exhibiting his pistols. The transit was successfully observed, but it took six hours for the operation. As the period approached, even the crew had felt the strongest anxiety for its success. The state of the sky was reported every half hour during the night before, and their spirits rose and fell as the report gave its answer, clear or cloudy. But at dawn the sky was brilliant, and the day passed without a cloud. Four other observations had been simultaneously made, in Siberia, Lapland, Hudson's Bay, and California. The general result gave the sun's distance at nearly ninety-four millions of miles.