Bulletin . =5 -h :? (W o? B & Ei-re ^ ,§ re ^ p a^<? 3 P S • P ? 2 i p -; ^- T o -1 3 B s-rewg-thBciS- K-P !c»BBt<iB«-i&j B re J - ^ ai--^ 2 c_i o ==2 2?? g; g_ P P re ^crq S o p o S » ^ «-c-ra o B-- o p 5a E ^ reS- =? re Ere C^^^ i7Q <1 O ^ ^ O CO -rf CO M- Oj ^.^?^^ o re p ^B-re B ^.,^^° E. KB- B- S! H. re re_. ° re are Si ° CO - EJ* fo re S-i Prg^ re a-2 ? _ ^- CO 21° r ?S gr g g-S- s& »= B re B to • P_ P 1^ ^ ?tiB-re 3 p p p n a ^o-^re ji i:d fo re S°, B SP ^ B re C re Bp ^^ B Bcg; ; =° W-S2 . ffi -! B_ w. 5 a Chart I. The graphs on this chart sho
Bulletin . =5 -h :? (W o? B & Ei-re ^ ,§ re ^ p a^<? 3 P S • P ? 2 i p -; ^- T o -1 3 B s-rewg-thBciS- K-P !c»BBt<iB«-i&j B re J - ^ ai--^ 2 c_i o ==2 2?? g; g_ P P re ^crq S o p o S » ^ «-c-ra o B-- o p 5a E ^ reS- =? re Ere C^^^ i7Q <1 O ^ ^ O CO -rf CO M- Oj ^.^?^^ o re p ^B-re B ^.,^^° E. KB- B- S! H. re re_. ° re are Si ° CO - EJ* fo re S-i Prg^ re a-2 ? _ ^- CO 21° r ?S gr g g-S- s& »= B re B to • P_ P 1^ ^ ?tiB-re 3 p p p n a ^o-^re ji i:d fo re S°, B SP ^ B re C re Bp ^^ B Bcg; ; =° W-S2 . ffi -! B_ w. 5 a Chart I. The graphs on this chart show the movements of fishes in the gradient tank%vhen no contaminating substance has been added at the end, and the water is there-fore of equal purity throughout. Graphs 1-5 have been previously published. The gradient tank is shown in Figure 1, N, on preceding page. This is a diagramof a longitudinal section of the lank. The left hand end was used for the introductionof water such as the fishes were taken from and the right hand end was used forthe introduction of water to which the substance being tested had been added. Thewater was introduced through a number of small openings in pipes which extendedcrosswise at each end of the tank, midway between top and liottom. The waterflowed out at the center from both top and bottom. This gave pure water at theleft hand end and usually in the ease of dissolved solids and liquids, throughoutabout one third of the tank while the approximate full concentration of the pollutingsubstance extended throughout
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
