76 THE BROOK BOOK 



reck nothing of praise or blame. They have but 

 one duty, that of depositing eggs, and time is 

 precious. One might suppose that instinct would 

 lead them directly to the water from which they 

 came and in which their young must be developed. 

 We know to our sorrow how strongly they are 

 attracted to lights and how many are thus de- 

 stroyed. Enough do go to the water to insure a 

 great army of May-flies for the coming year. 



The ease with which this creature may be 

 studied and the sentiment which attaches to its 

 short life make it especially attractive to the lover 

 of water brooks. The nymphs do not thrive in 

 still water and are, therefore, unsuitable for the 

 ordinary aquarium, but every stream abounds with 

 them, and who would not rather go to the brook 

 than to the aquarium? 



