The child's book of nature for the use of families and schools : intended to aid mothers and teachers in training children in the observation of nature . r are full of littlecells for the air to go into. It isin these cells that the blood ischanged by the now I will tell you about the lungs of fishes. But per-haps you will say that fishes do not breathe, and it cannot bethat they have lungs, for they would be of no use to them. Itis true that they do not have such lungs as we have; but theyhave lungs, and they really do breathe air. How is this, youwill ask, when they live in the water
The child's book of nature for the use of families and schools : intended to aid mothers and teachers in training children in the observation of nature . r are full of littlecells for the air to go into. It isin these cells that the blood ischanged by the now I will tell you about the lungs of fishes. But per-haps you will say that fishes do not breathe, and it cannot bethat they have lungs, for they would be of no use to them. Itis true that they do not have such lungs as we have; but theyhave lungs, and they really do breathe air. How is this, youwill ask, when they live in the water? There is a good deal ofair always mixed up with water, and the lungs of a fish are somade that the air in the water can change the blood in BREATHING. 31 How fishes breathe. Breathing of the lamprey eel. The voice. The gills of a fish are its lungs, and the way that they are usedis this. The fish takes water into its mouth, and lets it run outthrough the gills, and so the air that is mixed with the waterchanges the blood in them. The gills of fishes are thin, and thearteries and veins in them are very thin tubes. The air in thewater easily goes through the thin tubes, and the blood is airedby it, as it is in the lungs of land animals; only, the air that thefishes breathe is mixed with water. Our lungs are fitted tobreathe air alone, but the fish may be said to breathe air andwater together. Air alone does the fish no good; he cannotlive in it; he must have his air mixed with water, or it is of nouse to him. Here is a picture of the lamprey eel. You see that it has arow of holes on its neck;these are openings thatlead to its lungs ; there iare seven on each side. |It is from this that it is -sometimes called seven-eyes. In
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Keywords: ., bookauthorho, bookcentury1800, bookdecade1880, booksubjectscience
