Bulletin . concentration as in the case of Graph will be noted that while the fish was negative to the higher concentration, moreexcursions were made into the higher concentration, and more time was spent therethan in the case of the small-mouthed black bass. The tadpole-cat ranks with therest of the bullhead group in having a high resistance to adverse conditions. Graph 3 shows the reaction of a small-mouthed black bass to of carbonmonoxide per liter in the right-hand end of the gradient tank. The reaction isreversed as compared with that to carbon dioxide. The avoidance of the
Bulletin . concentration as in the case of Graph will be noted that while the fish was negative to the higher concentration, moreexcursions were made into the higher concentration, and more time was spent therethan in the case of the small-mouthed black bass. The tadpole-cat ranks with therest of the bullhead group in having a high resistance to adverse conditions. Graph 3 shows the reaction of a small-mouthed black bass to of carbonmonoxide per liter in the right-hand end of the gradient tank. The reaction isreversed as compared with that to carbon dioxide. The avoidance of the pure wateris striking. Graph 4 shows the reaction of the black bullhead to per liter of carbonmonoxide. The fish becomes slightly positive at the end of three minutes, and isincreasingly so as time goes on, indicating that the preference for the monoxideincreases with time. Graph 5 shows the movement of a specimen of a black bullhead when thereis no difference between the two ends of the tank. 571. I I I I ij,i I I I I I I I I I I M M iTl I I I I 1 I I I I Article —Equipment for umintaimng a Flow of Oxygcn-frccWater, and for controlling Gas Content* By Victor E. ShivLFord. In Article VI of this volume a piece of apparatus for controllinggas content and adding gases and fluids to water is described l)y thepresent writer. His earlier work, as well as that reported by Dr. Wellsin Article VIII, was done with that apparatus on a water table oftemporary construction, Init the table and the apparatus have bothbeen replaced by the permanent structures herein described. The newequipment consists of a large drain-table (13), shown in the lowerpart of the accompanying figure, with the boilers on the floor drain table is provided with double-decked towers nine feet high,for supporting bottles, tanks, etc. in the manner indicated in articlesVI and VIII of this volume. Aside from possessing many advantagesin the control of conditions where fluids and gases are added,
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