Bulletin . be leading to the top of B. Morewater from J flowed into A at the same time; but if the exchangewas made rather slowly, practically no mixing took place and analysisshowed the water in B to be saturated or even slightly supersaturatedwith CO. (3) The clamp between A and B was closed, B wasraised to the position shown in the figure, and the clamp between Band the burette was opened. The water now ascended in the burettetill it reached the level of the water in B. (4) By opening the burettecock the saturated water was now run into the glass tee at C, whereit mixed with the tap water.
Bulletin . be leading to the top of B. Morewater from J flowed into A at the same time; but if the exchangewas made rather slowly, practically no mixing took place and analysisshowed the water in B to be saturated or even slightly supersaturatedwith CO. (3) The clamp between A and B was closed, B wasraised to the position shown in the figure, and the clamp between Band the burette was opened. The water now ascended in the burettetill it reached the level of the water in B. (4) By opening the burettecock the saturated water was now run into the glass tee at C, whereit mixed with the tap water. The rate of flow from the burette wasdetermined by counting the drops per minute, the number of dropsper having previously been determined. (5) The mixture thenflowed through the experimental bottles of which D is the first. (6)Finally, as has been stated before, the actual concentration of gas inthe water in the experiment was determined by analysis. 561 I ,1,1,1,1,1,1,,,,,T. 562 The fishes were left in the experimental bottles until dead, andthe time between introduction and death (dying time) is the basis ofa comparison of the relative resistances of the different species. TableI is a summary of nine experiments in which four different concen-trations of CO were used. Table I ShOiving the relative resistance of several species of fishes to different concen-trations of carbon monoxide. The concentration of the CO solution which flowedthrough the experimental bottles is expressed in per liter. Species of fish Weight offish in grams CO liter CO liter CO 6 liter liter Moxostoma aureolum(Red-horse) 10—15 28 min. 10 min. Notropis blennius (Straw-colored minnow) 2—4 Ihr. 45 min. 28 min. Pimephales notatus(Blunt-nosed minnow) 1— 1 hr., 55 min. 1 hr., 20 min. Lepomis hnmilis (Orange-spotted sunfish) 2—6 5 hr., 40 min. 4 hr., 5 min. 1 hr., 5 min. 45 min. Lepomis cijanellvs(Green sunfish) 2
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
