178 Transactions of the South African Philosophical Society. 



also may distinguish between the paths of the different varieties of 

 depression, but it will certainly not greatly modify the mean direction 

 here claimed. 



TABLE 1. 



Monthly Means of Barometric Pressure during the Passage 



of a Depression. 



January . . . 

 February 

 March ... 



April 



May 



June 



July 



August . . . 

 September 

 October ... 

 November 

 December 



Year 



Day Before. 



Inches. 



26-011 

 26-045 

 26-069 

 26-124 

 26-205 

 26-238 

 26-147 

 26-111 

 26-143 

 26-090 

 26-040 

 26-013 



26-103 



Day. 



Inches. 



25-961 

 25-963 

 25-991 

 26-058 

 26-087 

 26-149 

 26-087 

 26-037 

 26-061 

 25-956 

 25-961 

 25-937 



26-020 



Day After. 



Inches. 



26-020 

 26-015 

 26-082 

 26-105 

 26-146 

 26-190 

 26-207 

 26-151 

 26-198 

 26-058 

 26-029 

 26-010 



26-101 



Normal 

 Means. 



Inches. 



26-008 

 26-067 

 26-089 

 26-177 

 26-223 

 26-299 

 26-249 

 26-231 

 26-171 

 26-086 

 26-039 

 26-025 



26-139 



