The vessel chosen for the expedition was the _Coquille_, a small ship, not drawing more than from twelve to thirteen feet of water, which was lying in ordinary at Toulon. The time spent in refitting, stowing the cargo, arming the ship, prevented the expedition from starting earlier than the 11th of August, 1822. The island of Teneriffe was reached on the 28th of the same month, and there the officers hoped to be able to make a few gleanings after the rich harvest of knowledge which their predecessors had reaped; but the Council of Health in the island, having received information of an outbreak of yellow fever on the shores of the Mediterranean, imposed on the _Coquille_ a quarantine of fifteen days. It happened, however, that at that period political opinion was in a state of fervid excitement at Teneriffe, and party spirit ran so high in society that the inhabitants found it hard to come together without also coming to blows. Under these circumstances it is easy to imagine that the French officers did not indulge in violent regrets over the privations which they had to sustain. The eight days during which their stay at Teneriffe lasted were given up exclusively to the revictualling of the ship, and to magnetic and astronomical observations. Towards the end of September anchor was weighed, and on the 6th of October the work of surveying the islands of Martin-Vaz and of Trinidad was commenced. The former are nothing more than bare rocks rising out of the sea, of a most forbidding aspect. The island of Trinidad is high land, rugged and barren, with a few trees crowning the southern point. This island is none other than the famous Ascencao--now called Ascension--which for three centuries had been the object of exploring research. In 1700 it was taken possession of by the celebrated Halley in the name of the English Government, but it had to be ceded to the Portuguese, who formed a settlement there. La Perouse found it still in existence at the same place in 1785. The settlement, which turned out expensive and useless, was abandoned a short time after the visit just referred to, and the island was left in the occupation of the dogs, pigs, and goats, whose progenitors had entered the island in company with the early colonists.