. The composition of expired air and its effects upon animal life. Respiration. 46 THE COMPOSITION (JK KXl'IRKD AIR, b b are the two aspirating flasks, of four litres' caijatity, partially filled with saturated salt solu- tion. By reversing their positions these aspirators give a continuous current of air. The rubber cork closing the top of these flasks carries two glass tubes with glass stopcocks, and the apparatus is so constructed as to maintain the air current in the same direction by closing one, and opening the other, of these glass stopcocks when the flasks are reversed in their positio
. The composition of expired air and its effects upon animal life. Respiration. 46 THE COMPOSITION (JK KXl'IRKD AIR, b b are the two aspirating flasks, of four litres' caijatity, partially filled with saturated salt solu- tion. By reversing their positions these aspirators give a continuous current of air. The rubber cork closing the top of these flasks carries two glass tubes with glass stopcocks, and the apparatus is so constructed as to maintain the air current in the same direction by closing one, and opening the other, of these glass stopcocks when the flasks are reversed in their positions. l"he Pettenkofer tubes containing the Ba(HO)2 are attached to the stative c, and those con- taining the pyrogallate solution to the stative li. e represents a stopcock in the tubing connecting the aspirators. This serves to control or arrest the Fig. 7. â Modified Hammond Apparatus (devised by Abliott). The results obtained with this modification of the apparatus are shown in Table H. The same animal was used in each of the six different experiments performed, and it failed to succumb to the conditions present in any of them. In the later experiments, in which the animal was placed in a one-litre bell-jar, it failed to reduce the proportion of O in the volume of air within the apparatus (about six litres) to such an extent as to endanger its life, even with the additional reduction of O taking place in the two Pettenkofer tubes containing Buchner's solution of alkaline pyrogallate. The percentage of CO., remained quite low through the absorption by the Ba(HO)2 in the five Pettenkofer tubes. The construction of the apparatus permitted the continuous circulation of the air within the apparatus so that the animal was constantly breathing air that had been breathed and Table H. modified " hammond " experiment. Examination No. Date. Animal. Weight. Aspiration- Number of absorbers. Capacity Time. of air. Remarks. CO,. 0. 1894 Grams. Hours. f« ^ 1 O
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