336 THE STORY-BOOK OF SCIENCE 



"One morning, " said Einile, "when you sent me 

 to get something from your room, I put my hand on 

 the little bulb of the thermometer. The red liquid 

 began to go up, little by little. " 



"It was the warmth of your hand that made it go 

 up." 



"I wanted to see how high the liquid would go, but 

 I had not patience to wait till the end." 



"I will tell you. At last the thermometer would 

 have marked at most 38 degrees, which is the tem- 

 perature of the human body." 



"And in the very hot days of summer what de- 

 gree does the thermometer mark?" asked Jules. 



"In our region the greatest heat of summer is 

 from 25 to 35 degrees." 



"And in the hottest countries of the world?" 

 Claire inquired. 



"In the hottest countries, Senegal, for example, 

 the temperature rises to 45 and 50 degrees. It is 

 twice as hot as our summer." 



