716 



iantic Ocean, nearly in the same latitudes as 

 Lamanon: but the observations of the latter 

 being much more numerous (extending from 

 22° 55' south lat. to 26° north lat., and corres- 

 ponding with every hour comprised in 32 days 

 and 82 nights), the results to be drawn from 

 them appear to be more worthy of confidence, 

 M. SimonofF stops at + 9 h 39' in the morning ; 



— 3h 23' afternoon ; + 9 h 47' in the evening; 



— 3 h 25' after midnight. These epochas of the 

 maxima and the minima, determined by the 

 mean with extreme precision, and by the ob- 

 server, prove, that notwithstanding a difference 

 of 140° of longitude, the atmospheric tides fol- 

 low the same hours # within 18 minutes, in the 

 equinoxial regions of the South Sea, and the 

 Pacific Ocean. 



B.In the temperate zone. When I endeavoured, 

 in the physical table of the equatorial regions -f, 

 to call tlje attention of the learned of Europe to 



* This regularity or correspondence of epochas east and 

 west of America, is no doubt very striking ; but to disengage 

 the Atlantic results of M. SimonofF from the influence of the 

 temperate zone, where he passed from 24° to 26° north lati- 

 tude 5 I calculated, on the registers which he confided to 

 me, only the observations made between 8° 26' south lat. 

 and 8° 22 7 north lat. In that extent of the Atlantic, I find 

 + 9 h 42! in the morning, — 3 h 80 1 afternoon, + 0 h 48' in the 

 evening ; — 3 h 2 ' after midnight. 



t See my essay on the geography of plants, 1807, p. 94. 



