CLOUDS AND RIVERS, ICE AND GLACIERS. l'Ji 



special planes. It will also liquefy, not uniformly, but 

 along special surfaces. Both the sliding and the lique- 

 faction will take place principally at right angles to the 

 pressure, and glacier lamination is the result. 



490. As long as it is sound the laminated glacier ice 

 resists cleavage. Regelation, as I have said, makes the 

 severed attachments good. But when such ice is exposed 

 to the weather the structure is revealed, and the ice 

 can then be cloven into tablets a square foot, or even a 

 square yard in area. 



§ 67. Conclusion. 



491. Here, my friend, our labours close. It has 

 been a true pleasure to me to have you at my side so 

 long. In the sweat of our brows we have often reached 

 the heights where our work lay, but you have been 

 steadfast and industrious throughout, using in all pos- 

 sible cases your own muscles instead of relying upon 

 mine. Here and there I have stretched an arm and 

 helped you to a ledge, but the work of climbing has 

 been almost exclusively your own. It is thus that I 

 should like to teach you all things ; showing you the 

 way to profitable exertion, but leaving the exertion to 

 you — more anxious to bring out your manliness in the 

 presence of difficulty than to make your way smooth by 

 ioning difficulties down. 



492. Steadfast, prudent, without terror, though not 



