82 PHOSPHORESCENCE IN 



berose, different varieties of Nasturtium, the Yel- 

 ow Lily, and some other plants. 



The Swedish naturalist, Professor Haggern, per- 

 ceived one evening a faint flash of light repeatedly 

 dart from a marigold (fig. 7) . Surprised at such 



Fig. 7. 



an uncommon appearance, he resolved to examine 

 it with attention, and, to be assured that it was no 

 deception, he placed a man near him with orders 

 to make a signal at the moment when he ob- 

 served the light. They both saw it constantly at 

 the same moment. The light was most brilliant 

 upon marigolds of an orange or flame colour ; but 

 scarcely visible on pale ones. The flash was fre- 



