26 



TEMPERATURE. 



(6) The greatest difference is found on clear, calm days. 



(c) High winds not only raise the temperature in McMurdo Sound and on the Barrier, 

 but also reduce the difference and occasionally remove it altogether. 



Spring Temperature on the Barrier. — After the return of the Cape Crozier Party the 

 Barrier was not visited again until September when the sun had returned and spring condi- 

 tions were becoming established. 



On September 9 a small party led by Evans left Cape Evans to visit Corner Camp 

 (for position see figure 2). At Hut Point they again had temperatures similar to those at 

 Cape Evans, and on reaching the Barrier low temperature;; were immediately experienced. 

 The following table gives the mean daily temperatures met with during a stay of four days 

 on the Barrier :— 



Table 6. 



On the journey a minimum temperature of — 72°F. was registered. 



Although much wind was met with on the Barrier and the sky was overcast, low tem- 

 peratures prevailed on the Barrier, where the mean temperature for the period was 16-8°F. 

 below the simultaneous temperature at Cape Evans. 



Summer Temperatures on the Barrier. — During the summer (from 1st November, 1911), there 

 was a great deal of travelling backwards and forwards on the Barrier. Each party was 

 provided with meteorological instruments and in consequence a great many data are avail- 

 able. It would take up too much space to discuss the results of each party in detail and 

 therefore the actual observations have been printed in Vol. Ill, and here we will confine 

 ourselves to a general discussion of the results. The curves on figure 6 show the tempera- 

 ture observations in a very comprehensive manner. In this figure the mean daily tempera- 

 tures at Cape Evans are shown by the upper thick line. The observations on the Barrier 

 have been divided into two sets, one comprising those made to the north of One Ton 

 Camp and the other those to the south. The former are shown by a thin continuous line 

 and the latter by a thin broken line. The observations made on the plateau are shown 



