164 THE STORY-BOOK OF SCIENCE 



trifled sheet flat above little pieces of paper, straw, 

 or feathers. These light bodies are attracted and 

 repelled in turn ; they come and go rapidly from the 

 electrified strip to the object which serves them as 

 support, and from this to the strip. " 



Adding example to precept, Uncle Paul took a 

 sheet of paper, folded it in a strip to give it more 

 resistance, warmed it, rubbed it on his knee, and 

 finally made a spark fly from it on the approach of 

 his finger-joint. The children were full of wonder 

 at the lightning that sprang from the paper with a 

 crackle. The cat's beads were more numerous, but 

 less strong and brilliant. 



They say that Mother Ambroisine had much 

 trouble that evening in getting Jules to go to bed; 

 for, once master of the process, he did not tire of 

 warming and rubbing. His uncle 's intervention was 

 necessary to put an end to the electric experiments. 



