160 REVISIONS OF THE THEORY OF ELECTROLYSIS. 



adjusts itself to the new illumination. One dreary dsij in April I 

 took the train in Switzerland over the St. Gotthard route. We 

 entered the north end of the tunnel at Goeschenen with a clouded 

 sky and snowflakes swirling through the air. Ten minutes passed 

 in the darkness a thousand feet beneath the village of Andermatt — 

 fifteen, seventeen, and then the train ran out on the Italian side of 

 the great divide at Airola into a burst of sunshine and clear sky 

 and white-capped Alpine peaks and tempered winds and the pale 

 green of olive groves. So sudden was the transformation that an 

 involuntary exclamation of surprise and delight ran through the 

 train. The experiences of the last twenty years warn us that we 

 must be prepared for similar surprises in the illumination that 

 physical science is shedding on the world of nature. "VVe need not 

 prophesy ; we need only work and wait. 



