154 THE STORY-BOOK OF SCIENCE 



"Very willingly; but when we are all together, so 

 that each one may profit by it. No one ought to 

 ignore the danger one runs in taking shelter under 

 a tree during a storm. " 



In the meantime the rain-cloud with its lightnings 

 and thunders had moved on into the distance. On 

 one side, the sun was setting radiant; on the oppo- 

 site side, in the wake of the storm, the rainbow bent 

 its immense bright arch of all colors. Uncle Paul 

 and Jules started on their way, without forgetting 

 the famous caterpillars' nest which might have cost 

 them so dear. 



