HEIGHTS ON THE BEARDMORE GLACIER. 289 



No correction has been applied for the humidity of the air and for latitude as both of 

 these are much too small to be considered. 



Difference in height between Pony Depot and Mid-Glacier Depot. 



Feet. 



(a) Polar Party Outward 3,003 



(6) Polar Party Returu 3,203 



(c) First Return Party 3,231 



Mean . 3,147 



(d) Simultaneous Observations . . . . . . . . .3,117 



Mean . 3,132 



(a), (b) and (c) were obtained by the method described above. The same barometer was 

 used for (a) and (b) and a different one for (c), it is therefore gratifying to see that the 

 values for (b) and (c) are so nearly alike. 



The mean value from the three sets of observations («), (b) and (c) is 3,147 feet. When 

 the Polar Party was at Mid-Glacier Depot on their outward journey Meares was on the 

 Barrier only a short distance from the foot of the Beardmore (82° 21'). Thus we have 

 simultaneous observations with the two stations not very far apart. The observations reduced 

 ia a similar manner give the value (d) which is for all practical purposes identical with the 

 mean of (a), (b) and (c). As a simultaneous observation is of more value than observations 

 taken by the method used for (a), (b) and (c) ; {d) has been given the same weight as the 

 mean of the other three observations and the difference in height between the Pony Depot 

 and Mid-Glacier Depot is thus determined to be 3,132 feet. This determination must be 

 considered highly satisfactory as the values obtained by the two methods and with three 

 different barometers agree so well together. 



Difference in height between Mid-Glacier Depot and Upper Glacier Depot. 



Feet. 



(a) Polar Party Outward 3,870 



(6) Polar Party Return 3,839 



(c) First Return Party 3,838 



Mean . 3,849 



These three determinations agree so well that their mean may be accepted with great 

 confidence, (c) was again obtained with a different barometer from (a) and (6). 



Difference in height between Upper Glacier Depot and 3° Depot. 



Feet. 



(a) Polar Party Outward 2,353 



(6) Polar Party Return 2,177 



Mean . 2,265 



For this interval observations made by the Polar Party only are available, and the two 

 determinations do not agree with one another so well as the previous ones. Fortunately there 

 is a simultaneous observation which checks the whole determination for the Barrier to 

 3° Depot. 



37 



