17 



tin- Iii'li.in .li\ i>i..n, .uid between the 84th and the 55th in th. I'M ill- The 



< rntres entered the on on or near the 58th parallel, thence about one third of them moved 



north-eastward, and the remainder pMMd between Danco Land and the South Orkney*. During the- 

 in.. nt h the 5Srd WM the avenge parallel along which the centres travelled eastward in tho 

 .'.n i. : ,.n, and they followed a path between the 56th and 57th in that of the Pacific. After pawing 

 the 56th meridian of W. longitude, about half the -ntral areas of depression travelled East-south-east 

 between Palmer Land and Danco Land and the South Orkneys, and the other half passed away to the- 

 north-eastward. 1 hiring Autumn and Winter the paths were confined to cones between 48* S. and 49* 8. 

 in th.- South Indian division, and between 55* 8. and 56* 8. in the Pm-iti- After entering the Atlantic 

 n, i.iih.-r less than one thin) <>f the .mires moved east-south-eastward or eastward across Danco 

 nt between Danco Land .-md tin- South Orkneys, the remainder passing east-north-eastward or 

 eastward into the Athmtir. A few crossed Tierra del Fuego or the southern extremity of 

 I' 



The paths of c-v, I..HK centres are found to have been more scattered during the Autumn and Winter 

 months than in Spring and Summer in all part* of the Southern Ocean. 



i !.>nic storms, presumably of tropical origin, are represented on each of the charts on which the 

 central positions of Summer and Autumn depressions were plotted, but they are confined to the western 

 a of the Pacific divisi-.ii <>f the Southern Ocean. These appear to have moved into the Tasman Sea 

 from the north-westward, one in the Summer of 1901 and one in each of the Autumns of 1902 and 1903. 

 The centre of the 1902 storm moved south-eastward to the north-west coast of New Zealand, then. < 

 south, passing through Cook Strait, and subsequently zigzagged to the eastward. It can be identified on 

 the daily charts from a position in about 34' S., 169$" E., on the 12th December to a position in about 

 54 J S., 148}* W., on the 19th of that month, representing a travel of 2187 nautical miles, at an average 

 rate of translation of 312 nautical miles per day. 



The cyclones of the Autumns of 1901 and 1903 moved east-south-eastward after crossing the 30th 

 parallel, but cannot be traced to the eastward of the 180th meridian. 



The tropical disturbance of December, 1901, above mentioned, is not the only cyclonic depression that 

 can be traced on the daily charts for a number of days consecutively. Similar instances of identification, 

 day after day, of such systems after their initial location can be cited as follows : 



March 7-15, 1902. From 56 S., 146' W. to 55* 8., 80* W. - 2243 miles; 280 miles per day. 

 May 2-10, 1902. From 53" S., 102' E. to 47' S., 175* E. - 2840 miles; 355 miles per day. 

 May 29-June 5, 1902. From 47 J" S., 17* E. to 60* 8., 83* E. = 2433 miles; 34 miles per day. 

 September 2-9, 1902. From 57' S., 80* E. to 47' S., 131 J* E. - 2510 miles ; 359 miles per day. 

 May 16-23, 1903. From 54' S., 131' W. to 58' S., 72* W. - 1995 miles ; 285 miles per day. 



;.tember 21-29, 1903. From 47J* 8., 89' E. to 50J* S., 130* E. - 1625 miles; 203 miles per day. 

 December 10-17, 1903. From 40' S., ISO* E. to 55' S., 171* E. - 1890 miles; 270 miles per day. 

 February 8-15, 1904. From 40* S., 164* E. to 52J* S., 166* W. - 1890 miles; 270 miles per day. 



If ihe centres of the respective cyclonic depressions have been correctly located, the average <laily rate 

 at which they progressed was nearly 300 miles. 



While the number of cyclonic systems that can be identified for four or more days in succession, during 

 their passage over the ocean, is large, the only moving anticyclonic systems that can be traced for more 

 than three consecutive days are : (1) Those that appear to have their origin to the west of Australia, the 

 centres of which travel eastward, join the Australian " high," and subsequently move across or to the south 

 of Australia, over the Tasman Sea and New Zealand or immediately north or south of those islands, and 

 then disappear over the Pacific. (2) Those that move eastwards from the South American Continent, 

 orer the sea, and soon after disappear over the Atlantic. 



The former appear to originate as secondary high-pressure systems thrown off the South Indian 

 .intii vclone ; the latter appear to form over the land. 



As regards the paths of anticyclones, shown on the chart*, the instances are rare in which areas of high 

 barometer, other than those that obviously form part of the permanent anticyclones of the great oceans, 



D 



