THIS great traveller, as Andiffret and Viguier observe, was one of those men, who, in the course of the eighteenth century, reflected the greatest honour upon Spain. He was born at Seville on the 12th of January, 1716. His family, already distinguished in the navy, began to prepare him from his earliest years for following the same career. His education was conducted with extraordinary care. In 1733 he entered the service, and his progress very quickly exceeded the most sanguine hopes which the first manifestations of his character had given birth to. The first commission with which he was intrusted was the scientific expedition concerted between the ministers of France and Spain, for the purpose of measuring a degree of the meridian near the equator, while another expedition was despatched to measure other degrees under the polar circle, in order to form a judgment of the different parts of the earth’s circumference, by their equality or inequality, and from thence to determine its magnitude and figure. The province of Quito, in Peru, appearing to offer the most favourable equatorial position for performing this enterprise, which seemed likely to be long and laborious, the ministers of Louis XV. made application to Philip V. of Spain, for permission to send a certain number of French academicians into Peru, in order to make there the necessary observations. Philip referred the matter to the Council of the Indies, and, on their favourable report, the license was granted, with all the necessary recommendations and assurances of the royal protection to the travellers. He moreover appointed two officers of his navy, says Ulloa, well skilled in mathematics, to join in the observations which were to be made, in order to give them a greater dignity, and a more extensive advantage; and that the Spaniards might owe only to themselves the fruits and improvements expected from them. The two officers appointed for this service by Philip were Don George Juan, and Don Antonio de Ulloa. Previous to their departure, these two gentlemen were promoted to the rank of lieutenant in the royal navy. Having received their instructions, they set sail in separate ships from Cadiz Bay, May 26th, 1735, and on the 9th of July arrived in the bay of Carthagena. Here they found on landing that the French academicians had not yet reached the port, and as they had been instructed to await their arrival at this city, they determined to employ the interval in making nautical and astronomical observations. They were allowed ample leisure by the delay of the French travellers, who did hot join them until the 15th of November, when they all proceeded together, by the way of Porto Bello, Panama, and Guayaquil, to their ultimate destination.