Forbes. — Survey of Illinois River 



77 



waters supervised; and that here also it depends largely on 

 the surroundings of the nests and on the course of events, 

 whether the eggs shall hatch or become fungused. The 

 black bass prepares its nest in advance, sweeping off the 

 rubbish and laying bare the roots of the water plants among 

 which its nests are commonly placed, and its eggs are much 

 less subject to destruction in this way than the eggs of the 

 carp, which are thrown out indiscriminately and without pre- 

 vious preparation. Furthermore, as we all know, the black 

 bass takes care of its nests and looks after its fry at first, so 

 that the bass has a great advantage over the carp in respect 

 to the survival of its young. 



UPPER ILLINOIS RIVER AND 

 PRINCIPAL TRIBUTARIES 



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