ANNUAL VARIATION. 



169 



29-40 



29-30 



2920 



29-10 



29-40 



29-30 



29-20 



29-10 



2900 



28-80 



29-40 



29-30 



29-20 



29-10 



29-00 



Jan. Feb. March April May June July Aug. V Oct. Nov. Dec. Jan. 



Fig. 55. Annual variation of piessiire. 

 (iVo<e.— Values in curvo (a) plotted -O.SS" too low.) 



22 



