Plate X 



VIEWS OF THE ENTRANCE OK THE MORTERATSCH GROTTO, HOTH TAKEN FROM 

 THE SAME POSITION AND SHOWING THE SLOPE OF MUNT PERS BEHIND. 



Photographed i/th September 1907. 



Fig. 6. Photographed 5th September 1911. 



The wastage of ice due to superficial melting is shown by the increased exposure 

 of the slope of Munt Pers. The lateral wastage is indicated by the perspective of 

 the figures; and, by measurement, it amounted to 35-6 metres in the four years. 



