216 



HOBBS— ROLE OF GLACIAL ANTICYCLONE [April 24, 



sion of its circulation outward beyond the glacier margin as an inde- 

 pendent measure of its energy. This latter line of inquiry is a 

 particularly fruitful one, for hitherto there has been a general 

 tendency to delimit the zones of wind within the Southern ocean in 

 terms of parallels of latitude.^- Some years ago under the strong 

 impression that the vigor of the Antarctic anticyclone should domi- 

 nate within an extra-marginal zone upon the sea, I plotted the wind 

 observations regularly made by the Wilkes Exploring Expedition f^ 



Fig. 8. Map of a portion of Antarctica on which the wind directions 

 recorded by the Wilkes Exploring Expedition have been plotted, but with the 

 margins of the continent corrected so as to accord with Mawson's map. The 

 arrozvs point to the wind quarter. 



but was puzzled to find that, whereas there was evident control by 

 the anticyclone within a zone several degrees in width for all points 

 to the westward of long. 150° E., this did not hold for the eastern 

 portion of the route. Now that Mawson has definitely shown®* 

 Wilkes to have been in error in locating the margin of the con- 

 tinent for that portion of his route to the ^eastward of longitude 

 150° E., the apparent lack of harmony which I encountered is suffi- 



^2 Cf., for example, Meinardus, 1. c. 



•33 " Wilkes's Exploring Expedition," Vol. 11 (Meteorology), pp. 272-296. 



^•^Geogr. Jour.. Vol. 44 (September, 1914), pp. 257-286. 



