748 



Havannah. — Mean of the months during the 

 years, 1810-1812. 



Barometer. Centigrade 

 Thermometer. 



January 0.76809 m 21. L° 



February 0.76301 22.2 



March 0.76428 24.3 



April 0.76301 26.1 



May 0.76199 28.1 



June 0.76453 28.4 



July 0.76453 28.& 



August 0.76123 28.8 



September 0.76098 ... 27.8 



October 0.76174 26.4 



November 0.76453 .. 24.2 



December 0.76656 22.1 



Mean of the year 0.76371 25.7 



The least height of the barometer, during 

 those three years, was at 25° of temperature, 

 and in a furious wind from S.S.W. on the 

 25th October, 1810, it was 6.74472™; the 

 greatest height was observed on the 20th of 

 February, 1811, and was 0.77545™ : the dif- 

 ference of those two numbers (0.03073 ra ), is the 

 greatest barometric variation ever observed in 

 that island. During the stay I twice made at 

 the Havannah, my barometer rose (the tempera- 

 ture being the same), during the strong gales 

 from N.N.E. 4 lines (9 millimeters) more than in 



