CH. II1.] HOW THEY ARE PRODUCED. 49 
Carp’s habit, while “priming” along the edges of 
ponds at night, of sucking in from the interstices 
amongst the bricks, &c., any insects which may be 
lurking there, and which he could not otherwise 
get within reach of his mouth, and afterwards 
rejecting any substances which may not suit him, 
all “between wind and water,” as a sailor would 
say. The fact that these noises are louder, more 
prolonged, and more frequent in a pond faced with 
brickwork, than in one the sides of which slope off 
gradually and present a comparatively even sur- 
face, seems to lead to this conclusion. When 
feeding Carp with bread, you may often see this 
power of suction exercised by one as he rises 
almost perpendicularly under a piece floating on 
the surface, and draws it down in a little vortex 
to his scarcely visible mouth, which, by the way, 
is thus enabled to take in much larger morsels 
than it otherwise could. A few minutes’ close 
inspection of gold fish in an aquarium will shew 
the same process of indraught and expulsion con- 
tinually in operation. 
J have no doubt that, owing to this habit of the 
Carp in thus priming along the sides of ponds at 
night, a night-line set with the bait hung on the 
surface of the water, close to the edge, would be a 
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