Variations of the Barometer. 



295 



and smaller in December and January, when the earth is 

 nearest the sun. In the following table, the mean heights 

 are reduced to the zero of temperature. 



Monthly Mean Heights of the Barometer at Bogota, Lot. 



4° 55 50. 



The results contained in this table are confirmed by the obser- 

 vations of M. Caldos in 1807 ; and it appears also from fourteen 

 years observations of Herrenschneider, at Strasburg, that the 

 monthly means are higher in September, and lower in April. 

 The following are Herrenschneider's observations, reduced 

 to 15* centigrade. 



Result of 

 14 Years. 



January, 



February, 



March, 



April, 



May, 



June, 



July, 



August, 



September, 



October, 



November, 



December, 



Mean Height of the 

 Barometer in Lines. 



333.128 

 333.452 

 332.905 

 - 332.449 

 332.516 

 333.416 

 333.168 

 333.352 

 333.835 

 332.981 

 332.866 

 332.700 



From seven years observations made at Clermont, M. Ra- 



