19 



Atlantic anticyclone was found to occupy different positions in the correspond i UK month or months on the 

 charts of each of these years. He found that if !ii MIAN'S ..hurt*, puhli,h.-d in l*r,'j, arc compared 

 those prepared by the same authority for 1870-84, or if MOHN'H charts published in 1879, 183 and 1903 

 are compared with those prepared by the Meteorological Ollic.-, wl.i.-h are based on oWrvatiniu recorded 

 in nearly 3300 logs extending over the period 1855-99, the me.-.n monthly JM, lion^nlnt 



will be found to vary very considerably both in latitude and longitude < 



in addition to the seasonal migration of the high-pressure belt, which has so long lieen recognised, there 

 is a progressive displacement going on from year to year, in consequence of which the tome 



years nearer to the Equator than in others. He believed ho had found .strong evident of cyclical change! 

 having taken place in the belt's latitude, and of the existence of an interval of 9J years between the times 

 of its passing from its extreme northern to its extreme southern positions, and via tertA. If Colonel 

 RAWSON'S theory be correct, the belt should have reached the southern limit of its oscillation in 1903. 

 Now although the southern margin of the high-pressure belt in the several divixions of the ocean, as 

 shown on the monthly charts for that year, appears to be in about its average position a* regard* 

 latitude, it must be admitted that the monthly charts for both 1901 and 1902 place the margin of the belt 

 in lower parallels. 



SUMMARY OF THE OBSERVATIONS OF WIND. 



On Tables I. to IV. are set forth the number of observations of wind from each of eight cardinal and 

 inter-cardinal points of the compass, and of variable winds and calms recorded in the Southern Ocean 

 during the thirty-months period, October 1901 to March 1904; inclusive also of the number of instances 

 on which these winds attained to gale force. 



For the purposes of comparison the observations are arranged according to (1) the respective seasons, 

 (2) the divisions of the Ocean, and (3) the zones to which they relate. 



In the classification adopted (p. 16), the months of September, October, Noveml>er are regarded as 

 representing Spring; December, January, February as representing Summer ; March, April, May, Autumn; 

 and June, July, August, Winter. The following are the meridional boundaries selected for representing 

 the three divisions of the Southern Ocean, 150 E. to 70 W., Pacific; 70 W. to 20' E., Atlantic; 20' E. 

 to 150 E., Indian. The grouping of ocean wind and gale frequency into zones of ten degrees of latitude 

 is adopted for convenience. 



Tables V. to IX. state the directions from which the largest and smallest percentages of winds of all 

 forces, and of gales only, were recorded in each of the zones and divisions of the Southern Ocean referred 

 to, in the respective seasons of the year and in all seasons, during the thirty months period. 



Table X. furnishes similar information relating to the Southern Ocean as a whole. 



D 2 



