Table 6. - The symbols "a", "b", "c" , "d" refer to the foix.- corners of 

 the square, mentioned on page 29, for which barometric pressures (in inches 

 of mercury) A, B, C, D, respectively, nere calculated by interpolation 

 beti.'een isobars on daily vreather maps. The figures given are monthly sums 

 of these daily intei'polations . The points are located approximately as 

 follows: 



a, lat. 32^ 26' N.; lonj. 126° 12' -j. ; b, lat. 35° I6' N. , long. 



121° 1-:^' ■■;. ; c, lat. 30" 58' N.3 long. 110° 28' \i.; d, lat. 23° I6' N.; 



long. 123° 17' 'T. 



They are 3o placed that (A+D) - (3+C) will give a pressure gradient in 

 a direction from v^hich one would infer a wind parallel to the coast line, 

 assuming deflection to be 73 degrees. Similarly, the difference betvreen 

 (A+B) and (C+D) would give a pressure gradient from v/hich a wind at right 

 angles to the coast would be inferred. For the study discussed in this 

 paper, the aforesaid differences vrere computed from twelve-month sumiTia- 

 tions of the monthly sums of daily pressures. They were treated as com- 

 ponents, and converted to their corresponding ■"esultants (R) with the fol- 

 lowing formula: 



R = "V [(A+D) - (B+C)/ + [(A+B) - (C+D)]^ 



128 



