. The Family tutor . Fig. Fig. 39. being no under an air-pump without being much disturbed ; drawing the air the animal instantly shows signs of distress, and if the experiment is continued, soon dies. (Fig. 39.) So, too, if a jar containing some small fishes be placedunder an exhausted receiver, the animals either float on their backs at the surface ofthe water; or descend only by violent muscular exertions. Fishes respire the air whichis dissolved in water, and hence it is somewhat remarkable that they continue to livefor a considerable length of time in an exhausted receiver. The air i
. The Family tutor . Fig. Fig. 39. being no under an air-pump without being much disturbed ; drawing the air the animal instantly shows signs of distress, and if the experiment is continued, soon dies. (Fig. 39.) So, too, if a jar containing some small fishes be placedunder an exhausted receiver, the animals either float on their backs at the surface ofthe water; or descend only by violent muscular exertions. Fishes respire the air whichis dissolved in water, and hence it is somewhat remarkable that they continue to livefor a considerable length of time in an exhausted receiver. The air is also necessary to all processes ofcombustion. If a lighted candle be placedunder a receiver, it will burn for a length oftime ; but if the air be withdrawn by the pump,it presently dies out. The smoke also descendsto the bottom of the receiver, thereair to buoy it up. If a gun-lock be placed in an exhaustedreceiver, and the flint be made to strike, nosparks whatever appear ; and, consequently, ifthere were powder in the pan,
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Keywords: ., bookcentury1800, bookdecade1850, bookpublisherlondo, bookyear1851
