History of Astronomy for the Year 1805. 357 
some curious observations upon the tides of the Charante 5 
in which there’ are some particular circumstances which I 
intend to publish in a second edition of my Treatise on th¢ 
Flux and Reflux of the Sea, 
In 1787 he made some experiments upon the resistance 
of water, which ship-builders are much in want of. I have 
given the result of them in Montucla’s History of Mathe- 
matics, tome iv. p. 454, according to the account given by 
the commissaries of the academy. He gave a marine vo- 
cabulary in French and English ; and perhaps no person 
was ever more usefully or more constantly employed in this 
grand art, which is the principal source of the prosperity 
and grandeur of states. 
re was brother to the deputy, who obliged me to make 
the republican calendar in 1793, and who perished in the . 
troubles of the revolution on the 17th of June, 1795; the 
latter had been tutor to the children of count Stroganoff, a 
Russsian nobleman, who resided a long time at Paris. 
We have also lost M. de Chabert, a celebrated navigator, 
of whom I shall speak more at length. 
Joseph Bernard de Chabert, ci-devant marquis, chef d’es- 
cadre in the navy, commander of the orders of Saint Louis 
and Saint Lazarus, inspector of the marine depot, free asso- 
ciate of the Academy of Sciences, and lately member of the 
Board of Longitudes, and of the Royal Societies of London, 
of Berlin, Stockholm, Bologna, and Brest, was born at 
Toulon, 28th February, 1724. He was the son of an officer 
of the royal navy, and he entered into the service in 1741 3 
his father, when dying, caused himself to be carried on 
board the ship commanded by his son, and said, ‘ I shall 
now die without regret.’ 
In 1746 he went to Nova Scotia in a French squadron, 
He then sav’ how very defective the maps of America were ; 
he was a witness to the dangers our vessels experienced, and 
he gave an account of them upon his return. Lemonnier 
undertook to request permission of the minister to allow 
him to remain at Paris for the purpose of studying astrono- 
my, that he might go and remedy the inconveniences he 
had met with, and encourage the officers of the navy to 
Z 3 pursue 
