80 



TEMPERATURE. 



The values for 1902 and 1903 are taken from page 459 of the book quoted above, except 

 that the value for January, 1902, has been reduced to -05, because the value given, —1-0, is 

 ob\^ou.sly too large, and is based on defective observations as is pointed out by Dr. Chree 

 on page 460. It is obvious from the above table that if the mean corrections are applied, 

 the temperature derived from the mean maximum and minimum will not depart by one 

 dcn-ee from the true mean. They have therefore been applied to the observations for January, 

 1911, and September to December, 1912, thus giving two years' satisfactory mean temperatures 

 for 1911 and 1912. 



The following table summarises the above. 



Table 38. 

 Data used fur Mean Monthly Temperature in McMurdo Sound. 



Thus for McMurdo Sound we have temperature data for five years from three stations. 

 It will be shown later that Hut Point is probably slightly colder than Cape Evans which is 

 a^ain slightly colder than Cape Royds, but by combining all the observations we obtain a 

 better knowledge of the general temperature conditions in McMurdo Sound than could be 

 obtained by considering separately the observations made at each station. 



Cape Adare. — The observations taken at Cape Adare by the Southern Cross Expedition 

 under the leadership of Captain Borchgrevink have been published by the Royal Society in 

 the volume ' Southern Cross Antarctic Expedition, Magnetic and Meteorological Observa- 

 tions, 1902.' 



From March 4, 1899, to January 29, 1900, temperature observations were taken every 

 two hours between 9 a.m. and 9 p.m. As the mean of these observations would not give 

 a true mean temperature, the observations at 9 a.m. and 9 p.m. only have been used in 

 obtaining the mean monthly temperature. In this series no observations for February are 

 available, an approximate value has, however, been obtained by completing the curve of yearly 

 variation by freehand. 



The members of Captain Scott's Northern Party were at Cape Adare during part of 1911. 

 They took temperature observations as a rule every two hours from 8 a.m. to 8 p.m. In 

 June and July, however, the observations were taken every two hours throughout the day 

 and night. Thermograph records are not available, hence the mean monthly temperatures have 

 been calculated from the means of 8 a.m. and 8 p.m. observations. 



The observations are complete from March to December inclusive. The values for the 

 missing months January and February have again been supplied by completing the curve 

 for the remaining months by freehand. 



