702 



the barometer continued to descend without 

 interruption from noon till midnight. If the 

 variations were alike irregular at the foot of 

 Pichincha, during the whole year, the type of 

 those variations would probably not have been 

 ascertained by M. Godin. I regret not having 

 watched often enough at night at Quito, to 

 judge of the nocturnal tides; but the recent 

 observations which M. Duperrey, commanding 

 the French sloop la Coquille, has collected in 

 his voyage round the world, prove, that, south- 

 west of Pichincha, at the point of Payta (lat. 

 5° 5' south), the epochas of the limits are very 

 regularly, in the month of March, 9 h in the 

 morning and 3 b in the afternoon, ll h in the 

 evening, and 3 h in the morning. This result is 

 drawn from a fine series of observations made 

 every fifteen minutes during six days and six 

 nights, with a barometer of Fortin. The fol- 

 lowing table, indicating the hundredths of mil- 

 limetres, and the degrees of the centesimal 

 thermometer, is extracted from a manuscript 

 journal, kindly communicated to me by M. 

 Arago. 



