296 DISCOVERY REPORTS 



NOTES ON THE CHARTS 



Plate LXIX shows the apparent mean position of the ice-edge in the 

 summer months and Plate LXX in the winter months. Plates LXXI- 

 XCV show the observed positions of the ice-edge in different months, 

 and for most months there are three overlapping charts which cover 

 different parts of the Antarctic. 



Red lines indicate the assumed mean position of the ice-edge for the 

 month in question. 



Lines with different types of hatching are used to distinguish the ice- 

 edge positions observed by the Discovery Committee's ships, by factory 

 ships, and by other expeditions. Figures adjacent to the hatched lines 

 indicate the date and year, e.g. in a chart of September observations 

 "30.38" would mean 30 September 1938. The letters "P.A." following 

 such figures mean position approximate. 



// is to be noted that the charts shozv the observed positions of the ice- 

 edge, but not, except in a few instances, its observed absence. 



Place names are shown only in the charts for September (Plates LXXI- 

 LXXIII). 



