690 



Joao Baptista in Brazil *; of M. Arago, in 

 Spain and France ^ ; of M. Freycinet, at Rio 

 Janeiro and in the South Sea; of M. SimonofF};, 

 astronomer of the voyage of Bilinghausen, who, 

 during the years 1820 and 1821, observed 

 alone, from hour to hour, more than 4300 baro- 

 metric heights in the southern hemisphere, be- 

 tween 10° and 30° of latitude; of Captain 

 Sabine, on the western coast of Africa ; of MM. 

 Boussingault and Rivero, at La Guayra, and in 

 the Cordilleras of Columbia; and of M. Dnperey, 

 commanding the French sloop la Coquille, 

 who, in his voyage round the world, touched at 

 Payta on the coast of Peru. In the actual state 

 of the physical sciences, it is no longer neces- 

 sary to verify by new observations the existence 

 of a phenomenon so generally recognized ; we 

 rather engage travellers who cannot in their 

 journies in the interior of a continent, follow 

 the movement of the diurnal variations every 

 half-hour, during several moons, to direct their 

 attention successively to the particular circum- 

 stances that accompany, or modify the atmos- 



* Journal von Brasilien, Tom. i, p. 174; Tom. ii, p. 142. 



f See the result of the meteorological observations given 

 by this learned naturalist at the end of every year, in the 

 Annates de Chimie et de Physique, from the year, 1816. 



{ Iwan Simonoffy Beschreibung der Billinghausischen Ent- 

 dekkungsreise in das sudliche Eismeer, 1824, p. 33. 



