72 



FISHES OF THE CONNECTICUT LAKES. 



similar brooks throughout the entire region. The temperature of the 

 dead water of the main inlet rises to 65° F. near its entrance, almost 

 to the temperature of the lake itself. The lake registered lower than 

 smj of the other bodies of water visited. On August 17, 1904, the 

 temperatures were as follows : 



ROUND POND. 



The shallow water of the edge of Round Pond is turfed with needle 

 rush {Eleocharis acicula7'ls), the seven-angled pipewort {Eriocaulon 

 septangulare) ^ and the white lobelia {Lobelia dortmanna). At places 

 this turf yields to beds of Panicularia fluitans and Eleocharis pa- 

 histris, or to rocks. In deeper water is established a bed of Nymphcea 

 advena. 



The height of the hills protects the lake effectually from winds and 

 a long exposure to the sun. The temperature of the surface Avas that 

 of First Connecticut Lake at the same time, due possibly to the 

 broad shallow margin exposed to sun and air, but the temperature 

 declined very rapidly with the depth as follows : 



The color of the water was brownish, but otherwise clear and of 

 good flavor. On the whole this lake very closely resembled Third 

 Connecticut Lake as a plankton environment. 



LOCATION OF THE PLANKTON STATIONS. 



First Lake. — Six permanent plankton stations were established and 

 marked by buoys. Their positions are indicated by capital letters 

 upon the accompanying map. 



