854 



DR J. H. HARVEY PIRIE ON 



Rate of Glacier Movement. 



Presumptive evidence that the rate of movement is very slight is afforded by the 

 persistence of the snow talus in front of the ice-cliffs ; by the infrequency of the ice 

 falls ; and by the long continuance of pieces of ice at the terminal front apparently 

 just ready to fall but remaining in such a position of unstable equilibrium for months 

 on end. 



An attempt was made to ascertain the rate of motion by direct measurement by 

 setting up fixed marks on The Beach and on the snout of the glacier ending thereon. 

 The measurements were not taken by triangulation but by linear measurement, a 

 method which is not very satisfactory, as variations were introduced by the differing 

 amounts of snow-drift present on the snout, and at the foot of it. Even after making 



Brass tube sunk in fhe olacJcr 



Rock, on alacief neaT foot of sJioul' 



Pixed marU on 

 The liench 



Copelaiid 



ohser vcz tory 



Text-fig. 13. — Fixed marks on The Beach and glacier snout ending thereon. 



due allowance for this, the difference between the figures of 28th April 1903 and 

 12th February 1904, a period of 9^ months, is so small that it might well fall within 

 the limits of error of observation, and it cannot therefore be said that direct measure- 

 ment shows any perceptible movement in this glacier. For the sake of data extending 

 over more lengthy periods, the above plan, text-fig. 13, of one or two fixed marks may 

 be serviceable to future observers. 



Glacier Temperatures. 



Observations on glacier temperatures were made daily on the Scotia Bay ice sheet, 

 140 feet up on the snout ending on The Beach. Three thermometers were used — one 

 sunk to the level of the snow and ice junction ("shallow") ; one 2 feet into the solid 



