The situation of this place between the terrestrial and magnetic equators was most favourable for conducting observations on the variations of the magnetic needle. The naturalists also made excursions to the desert of Pierra, where they collected specimens of petrified shells imbedded in a tertiary stratum precisely similar to that in the suburbs of Paris. As soon as all the sources of scientific interest at Payta had been exhausted the _Coquille_ resumed her voyage, setting sail for Otaheite. During the sail thither a circumstance occurred which might have materially delayed the progress of the expedition, if not have led to its total destruction. On the night of the 22nd April, the _Coquille_ being in the waters of the Dangerous Archipelago, the officer of the watch all at once heard the sound of breakers dashing over reefs. He immediately made the ship lie to, and at daybreak the peril which had been escaped became manifest. At the distance of barely a mile and a half from the corvette lay a low island, well wooded, and fringed with rocks along its entire extent. A few people lived on it, some of whom approached the vessel in a canoe, but none of them would venture on board. Duperrey had to give up all thoughts of visiting the island, which received the name of Clermont-Tonnerre. On all sides the waves broke violently on the rocks, and he could do no more than coast it from end to end at a little distance. The next and following days some small islands of no note were discovered, to which were given the names of Augier, Freycinet, and Lostanges. At length, as the sun rose on the 3rd May, the verdant shores and woody mountains of Otaheite came in sight. Duperrey, like preceding visitors, could not help noticing the thorough change which had been effected in the manners and practices of the natives. Not a canoe came alongside the _Coquille_. It was the hour of Divine worship when the corvette entered the Bay of Matavai, and the missionaries had collected the whole population of the island, to the number of seven thousand, inside the principal church of Papahoa to discuss the articles of a new code of laws. The Otaheitan orators, it seems, would not yield the palm to those of Europe. There were not a few of them gifted with the valuable talent of being able to talk for several hours without saying anything, and to make an end of the most promising undertakings with the flowers of their rhetoric. A description of one of these meetings is given by D'Urville.