20 j^Kotint of the Voyage of Discovery 



theniatk-5 at Frankfort, in his Ephenrterides 

 of 69 years, or from An. 1§35 to 1694 : 

 Three magnitudes : 



Greatest 366 6 66 53 ) j^j^^^ 3(55 5 49 15 

 Least . 365 5 42 38 i 



GalifreilusVendelinus, a Dutchman . . . 1644 365 



Ismael Bulialdus 1645 365 



Johannes Baptista of Bononia .... 1651 365 



Philippus Lansbergius of Ghent .... 1682 366 



Dionysius Petavius, De Jtationc Tempor. . . . 365 



Dr. Gresforv in his Astronomy 365 



Cassinij'^Dr. Keil, &c 365 



IV. Jccount of the Voyage of Discovery and Circumnavigation 

 performed in 1818, 1819, and 1820, ly Capt. Freycinet, 

 Commander of the FrencU Corvette Urania*. 



JVl. Louis deFreycinet, captain of a frigate, to whom the King 

 had intrusted the command of the corvette Urania, in order to 

 make a voyage of discoveries in the South Seas, arrived at Havre 

 on the 13th of November 1820. 



The principal object of this expedition was to make the neces- 

 sary observations for determining the configuration of the earth, 

 and the strength of the magnetic power in the southern hemi- 

 sphere ; but having to traverse, during more than two years, a 

 great extent of sea, M. de Freycinet was also to take advantage 

 of all occasions which might offer to him, to augment our collec- 

 tions of natural history, to add new documents in hydrography 

 to those which are already deposited in the Royal Marine depot. 



The corvette Urania, fitted out at Toulon in the early part 

 of 18 17, was furnished with every article necessary for along 

 voyage ; she received a picked crew, and her quarter-deck was 

 composed of officers equally distinguished for their zeal and the 

 extent of their knowledge, 



A numerous collection of the best instruments for physical and 

 iiruitical astronomy were put on board, to be used in the experi- 

 ments and observations which were the essential objects of the 

 voyage. 



The Royal Academy of Sciences anxiously drew up, for M, de 

 Frevcinet, notes necessary to guide him in his researches into 

 general physics, natural history, geology, mineralogy, &c. 



After long delays, occasioned by the difficulty of getting on 

 board different objects necessary for the undertaking, the Urania 

 set sail on the l/th ofSep:ember 1817. 



Contrary winds obliged them to put into Gibraltar on the 11 th 



* Froui the Moiiitriir. 



of 



