1898-1902. No. 4.1 



PRESSURE. ANNUAL PERIOD. 



57 



THE ANNUAL PERIOD. 



The following Table shows the mean pressure for each month, 

 extracted from the Tables on pp. 6 to 50. Those of the incomplete 

 months are in brackets. 



These numbers give a regular annual period with a chief maximum 

 in March and a secondary maximum in November, and with a chief 

 minimum in August and a secondary minimum in January. The range 

 is 11.8 mm., and the mean for the year is 761.40 mm. 



The lowest observed pressures are : 



The means indicate an annual period with maximum in May and 

 minimum in January. The lowest observed pressure is 739.5 mm. on 

 the 15*1' September, 1900, noon. Wind East, backing from SW to NE, 

 velocity 8 m. p. s. 



