568 



Observations made simultaneously at Cumana and Carac- 

 cas, at the extremities of a column of air nine hundred me- 

 tres (four hundred and fifty toises) high, appear to me very 

 interesting. Though the port of Cumana is farther than 

 La Guayra from Caraccas, this port presents a point of com- 

 parison much more certain. The air circulates more freely 

 round Cumana, and it's temperature is less influenced by 

 local causes. Comparing, among the whole of the observa- 

 tions, twenty-one fine days, chosen indiscriminately in the 

 months of November, December, and January, I find, on 

 calculating the mean temperature of each day from the max- 

 imum and minimum observed, the following results : 



