From the Society Islands the _Resolution_ and _Adventure_ sailed westward, discovered Hervey's Island, and rediscovered the Tonga archipelago already visited by Tasman. Here they met with such a kindly reception, the natives coming out to meet them in canoes,[99] and running along the shore displaying small white flags, that the group was afterwards christened the "Friendly Isles". [The Tonga archipelago under a native king is now a British protectorate.] The people supplied them with abundance of fowls, pigs, bananas, and coconuts. [99] Cook describes the sails used by the Polynesians of the Tonga archipelago as being lateen, extended to a lateen yard above and a boom at the foot. When they change tacks they throw the vessel up in the wind, ease off the sheet, and bring the tack end of the yard to the other end of the boat. There are notches or sockets at both ends of the vessel into which each end of the yard is put. He describes the sails as being exactly similar to those in use at the Ladrone Islands. Cook gives the following description of a house of worship on Tongatabu Island built on an artificial mound about 18 feet above the level of the ground:-- It was of an oblong shape and enclosed by a wall or parapet of stone about 3 feet in height. From this wall the mound rose with a gentle slope and was covered with green turf, and on the top of it stood the house.... Three elderly men came and seated themselves between the Europeans and the temple and began a kind of prayer, which lasted about ten minutes, then led the way so that the house of worship might be examined. In front there were two stone steps leading to the top of the wall. From this the ascent to the house was easy. It was surrounded by a fine gravel walk and was built in all respects like a dwelling-house of the country, with poles and rafters, and covered with palm thatch, with eaves coming down to within 3 feet of the ground, and sides or walls made of strong matting. The floor of the house was laid with fine gravel, except in the middle, where there was an oblong square of blue pebbles raised about 6 inches higher than the floor. In two corners of the house stood images rudely carved in wood, which did not seem to be treated by the natives with much respect. The space of blue pebbles was a sort of altar, and on this the Europeans laid their offerings of things that the natives would be likely to prize.