19 



Atlantic antii \vlone was found to ic-nipy different position* in the corresponding month or month* on the 

 chart* of . years. He foim.l that if Hi n lift li:rt. publish.-! ,., IMV.I. arc compared with 



those prepar.-.! l.y the same authority for 1870-84, or if MOBN'H chart* publuhed in 1879, 1883 and 1903 

 are compared with thoM prepared by the Meteorological Office, which are baaed on observation* recorded 

 in nearly 3300 log* extending over the period 1855-99, the mean monthly position of the artio*<r*trt* 

 will }f f..un.l t.. vary very considerably both in latitude and longitude. Colonel KAWHON conclule<l that 

 in addition to the seasonal migration of the high pressure belt, which ha* so long been recognised, there 

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

 years nearer to the Equator than in other*. He believed he had found strong evidence of cyclical change* 

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

 of its passing from its extreme northern to its extreme southern positions, and vice r*l. If Colonel 

 theory I* correct, the belt should have reached the southern limit of its oscillation in 1903. 

 Now although the southern margin of the high-pressure Mt in the several division* of the ocean, as 

 shown on the monthly charts for that year, appears to be in alwut it* average position as regards 

 laiitiuk it must be admitted that the monthly charU for both 1901 and 1902 place the margin of the belt 

 in lower parallels. 



SUMMARY OF rill. 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 numlwr of instances 

 on which these winds attained to gale force. 



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

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



In the classification adopted (p. 16), the months of September, October, Novemlwr 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 



