777 



logy of well-observed facts, that even at La 

 Guayra, in another season, the barometric 

 mean, deduced from the maxima of 9 h , and the 

 minima of 3i h , might have been found a milli- 

 meter more or less. In order to leave no doubt 

 on the question here agitated, we should be 

 able to compare the mean of nine years at 

 Paris, with the mean of one year on the coast 

 of Venezuela. But hitherto we possess one 

 whole year of horary observations for one place 

 only in the tropical zone, between 0° and 15° 

 of latitude ; that place is the table-land of Bo- 

 gota, raised more than 2600 meters above the 

 level of the equinoxial sea. 



MEAN TEMPERATURE OF CUM AN A. HYGROMETRIC 

 AND CYANOMETRIC STATE OF THE AIR. 



During a stay of six months and a half at 

 the town of Cumana (lat. 10° 27' 52") I occu- 

 pied myself simultaneously by researches, 1st. 

 on the mean temperature of the placed the 

 increase of the heat at different hours of the 

 day, the temperature of the sea during the flux 

 and reflux -f, the intensity of the heat of the 



* See Per. Nar. Vol. Hi, p. 386, 458, 568, and 569. 

 i L. c. s Vol. ii, p. 142, 184 ; Vol. iii, p. 545. 



