22 



Dr. W. 1ST. Shaw. On the General [May 16. 



FIGURE 1. SURFACE ISOBARS FOR JANUARY. 

 REPRODUCED FROM HANN'S " METEOROLOQIE." 



riGUREE. ISOBARS AT THE LEVEL OF 4000 METRES FOR JANUARY. 

 FROM HANN* REPRODUCTION OFTHEORICINAL DIAGRAM BVTBSSCRENC OEBORT. 



Pressures in milUmetres : Velocities in miles per hour, corresponding to the acceleration for 

 different gradients resulting from the Earth's rotation. 



