PAN GONG: A GLACIAL LAKE 



603 



der the influence of the usual strong afternoon wind from the north- 

 west, it moved diagonally across the strand at the rate of 3 feet per 

 minute, with as steady a motion as though pushed by an invisible 

 machine. The sandy 



beach was shoved t- ■ ' j 



i 



into a ridge, as ap- ; , 



pears in the fore- 

 ground of Fig. 4, and 



flatstones 8 inches 



in diameter were 



easily moved. 



The quantity of 



ice thrust upon the 



beaches did not seem 



sufficient to account 



for all of the sudden 



disappearance. 



Thinking that a 



change in the lake's 



circulation must have 



been taken place, I resolved to test it by the degree of saltness of the 



water. On May i 

 and 2 I had tasted 

 the latter in the bay 

 east of Mun and 



-; elsewhere, and could 



'" scarcely detect the 



least salinity; on 

 May 4 and 5 I tasted 

 it again in the same 

 places, and found it 

 so salt as to be un- 

 drinkable. Appar- 

 ently with the break- 

 ing up of the ice 



Fig. ■;. — Ice on the south shore of Paneone, showina; , ,, . ^ 



u . • u .!-• 1 J f . • J- r u ^ under the mnuence 



sheets 4 inches thick and 40 leet in diameter shoved 



up entire. of the wind, Currents 



Fig. 4. — Ice piled up to a height of 13 feet by the 

 northwest wind on the south shore of Pangong during 

 the night of May 2, 1905. Notice the ridge of gravel 

 shoved up in the foreground. 



