Bulletin . asspent in one end of the tank than in the other. Graph 2 shows the movements of two individuals of the green sunfish. Wherethe broken line appears, the two were moving separately. It will be noted thatfishes made long stajs in the ends but usually moved back and forth nearly alwayswithout turning back at the center. Graph 3 shows the movements of a golden shiner in a uniform tank. It willbe noted that the fish rarely turns around except at the end. Graph 4 shows the movements of a specimen of Notropis. There was littleactivity and the fish turned back at the center once. Graph 5 sh
Bulletin . asspent in one end of the tank than in the other. Graph 2 shows the movements of two individuals of the green sunfish. Wherethe broken line appears, the two were moving separately. It will be noted thatfishes made long stajs in the ends but usually moved back and forth nearly alwayswithout turning back at the center. Graph 3 shows the movements of a golden shiner in a uniform tank. It willbe noted that the fish rarely turns around except at the end. Graph 4 shows the movements of a specimen of Notropis. There was littleactivity and the fish turned back at the center once. Graph 5 shows the movements of a specimen of rock bass. Graph 6 shows the movcme-nts of a specimen of the orange-spotted species often turned before reaching the end of the tank but the number ofturnings in the central third were the same from each direction. Graph 7 shows the movements of a long-eared sunfish. It sometimes turnednear the center, but about the same number of times from each end. Chart Chart IT. The relations of tank length to time scale is the same as in Chart I. In thecase of this and all the charts which follow, the iioUuting substance was introducedinto the right hand end of the gradient tank and is accordingly shown at the rightside of the graphs. The vertical broken lines are intended to indicate the locationof thirds of the tank length. The solid black area at the right between the twolines at the head of each grai>h is intended to show the part of the tank in whichthe polluted water is full strength and the narrowing of this black area from rightto left in the middle third is intended to indicate the region of principal unpolluted water contained about 5 cc. CO, per liter. X indicates that the fishbecame intoxicated; the arrow that it was driven. Graph 8 shows the positive reaction of an orange-spotted sunfish to 1 part ofweak waste to 25 parts of water. The tishes avoided the normal water and remainedmost of the time in the high c
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
