OF ARTS AND SCIENCES. 41 



darters, protected by tlieir color, lay half hidden among the 

 stones, looking more like tadpoles than fish. The dragon-fly 

 nymphs also rested among the rocks, motionless, awaiting their 

 prey — or, quite as likely, in that temperature, indifferent alike 

 to food and their surroundings. The may-fly larvae literally 

 swarmed here ; multitudes must have been hatched within a 

 comparatively short time. The seventy-eight counted were of 

 fair size — from one-half to three-quarters of an inch in length — 

 but no attempt was made to secure the myriads of tiny individ- 

 uals, seemingly but recently from the egg. The stone-fly 

 nymphs were beneath the stones, and many more than those 

 counted might have been secured had the cold not made further 

 collecting too tedious to be endured. The salamanders were 

 also beneath stones, but solitary. The dipterous larvae, foot- 

 less, and nearly an inch in length, appeared to roll aimlessly 

 about in the swift current, but none w^as seen to be carried 

 down the stream, although a careful watch was kept for such 

 an accident. 



It is believed that the results of the investigation tend to 

 prove : i) that the pond was as barren of life at the end of a 

 month as it was when first filled with water; 2) that the 

 nymphs and larv^ae of aquatic insects, belonging to the groups 

 mentioned in this paper, do not wander from their stations in 

 search of food, since it was impossible for those in the marsh 

 or in the brook to know that the pond contained no food for 

 them; 3) that even a flood, such as prevailed two days before 

 the examination, does not avail to carry insect and other forms 

 of aquatic life down stream against their will ; 4) that while 

 the water of the pand has been made barren by mechanical 

 means. Cold Brook itself, at least in its numerous rapids, teems 

 with animal life ; 5) that the restocking of the pond with in- 

 sect life, when it occurs, will be accomplished chiefly by ovi- 

 position, and not by the migration or transportation of insects 

 in the larval stage. 



