SEASONAL DISTRIBUTION OF THE ICE-EDGE 295 



JULY AND AUGUST (PLATE XCV) 



Of the five records in July and August four are derived from the series of repeated 

 cruises made by the 'Discovery II' in various months between July 1938 and March 

 1939. In July the ice was found very slightly farther north than in August, but it is not 

 likely that this is the normal condition, for in September (Plate LXXI) the ice-edge was 

 still farther north. Fluctuations in the winds and currents must often cause temporary 

 changes in the latitude of the ice-edge, and in the absence of better data we must 

 assume that it lies in about the same latitude in July and August. 



From the above notes it will be seen that although the observations are inadequate for 

 a completely reliable estimation of the normal position of the ice-edge in each of the 

 winter months, the available records are just sufficient, if compared month by month, 

 to show a fairly steady advance to the north from about March to July, and to give a 

 rough idea of the latitude in which the ice-edge is likely to be found in any particular 

 month. 



REFERENCES 



Antarctic Pilot, 1930. London. 



Antarctic Pilot, Supplement No. 7, 1938. London. 



Atlas over Antarktis og Sydishavet, 1936. Utgitt av Hvalfangernes Assuranceforening i Anledning av For- 



eningens 25-Ars Jubileum. 

 Bongrain, M., 1914. Description des cotes et banquises. Instructions nautiques. Deuxieme Expedition 



Antarctique Francaise. Sciences physiques : documents scientifiques. Pp. 1-60. 

 Clowes, A. J., 1934. Hydrology of the Bransfield Strait. Discovery Reports, IX, pp. 1-64. 

 Deacon, G. E. R., 1937. The Hydrology of the Southern Ocean. Discovery Reports, xv, pp. 1-124. 

 Hansen, H. E., 1934. Limits of the Pack-ice in the Antarctic in the Area between 40 W and no° E. 



Hvalradets Skifter, 9. Oslo. 



