358 History of Astronomy for the Year 1803. 
pursue the study of a science which equally contributes ts 
their glory and their security. At ‘the age of thirty he re- 
ceived the’cross of St. Louis, which he prehc Hel to a pen- 
sion. -At the return of peace in August’ 1748, he pre- 
sented a prospectus of the voyage and ‘the observations. 
M.-Reuillé and M. de ta Gallissonicre furnished him with 
instruments ; he sét sail in 1750, in a frigate commanded by 
the marquis de Choiseul-Praslin, aad he executed a chart of 
the coasts of Nova Scotia and Newfoundland, and of: the 
banks and islands inthe Gulf of St. Lawrence. I had the 
saisfaction of furnishing him with an object of comparison 
by my first observation of an eclipse of one of the satellites 
an ‘the @d of October, 1750. His voyage was printed in 
1753, in 288 pages in quarto. It contains observations on 
the magnet and upon currents ; details upon the calculations 
Which navigators require; all of which evince that he had 
already become a very good astronomer, and his example 
excited emulation in the navy, where it was much wanted. 
The first volume of the Savans Etrangéres, published by 
the academy in 1750, contains a memoir of M. de Chabert 
upon the longitude of Buenos Ayres. In the history of 
the year 1756, his observations made in 1753 along the 
coast of Spain and at Port Mahon are mentioned. In 1756 
he gave several other memoirs upon the transit of Venus, 
upon burricanes, and the eclipse of 1710. 
Tn 1758 he was received a member of the academy ; and 
on the 25th of April, 759, he read at his public entry into 
it his idea of constructing charts of the Mediterranean, for 
the ‘purpose of ‘making a second volume of the Neptune 
Francais, published in 1693, and thereby following the la- 
bours of Chazelle and Feuillée, who died in 1710. 
He set out on the first of May, 1764: after having laid 
down the eastern coast of Spain, he passed into Sardi- 
nia, and crossed over to Fez, Algiers, and Tunis, where he 
succeeded in determining several important longitudes, by 
means of a transit instrunient which he fixed on shore, and 
which he succeeded in placing in a few hours exactly in the 
meridian. | 
Tn 1767, after haying sailed round the coasts of Sicily, 
he 
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