POLAR ICE-CAPS AND SEA LEVELS. 339 



Forbes has demonstrated it by experiment, having 

 studied the glaciers moving down the Swiss valleys 

 and compared their motion with that of pitch. 

 And now I am going to show you that motion in 

 shoemaker's wax. Here is a piece (first model), you 

 see what it has been doing since last Monday when 

 it was placed a roughly rounded lump on the 

 board : it is now flattened out like a pancake. Then 

 here is another piece of shoemaker's wax that was 

 placed, on the 2nd December, 1886, at the bottom 

 of this jar with 10 bullets on the top and 14 corks 

 placed below. If you look at the bottom of the jar 

 you will see signs of bullets at the bottom, and you 

 all see that the corks are making way through the 

 wax and will be floating on the surface by and by. 

 I may inspect the corks a little by carving into 

 one of them. Probably in a fortnight that one 

 will have taken advantage of this aperture I have 

 just made. Thus, you see, in little more than a 

 year the bullets have all disappeared beneath the 

 wax, and the corks are coming to the surface. 



But there is another experiment going on in this 

 same jar. Three small cylinders of wood were each 



Z 2 



