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Updated: September 29, 2025
In these the floating bladder has turned into lungs, and the air-passage into a trachea. The lungs of the Amphibia have been transmitted to the three higher classes of Vertebrates. In the lowest Amphibia the lungs on either side are still very simple transparent sacs with thin walls, as in the common water-salamander, the Triton. It still entirely resembles the floating bladder of the fishes.
Each few inches it broadened into a noteworthy volcanic dyke, now yellow in its absolute purity, at times a bluish black when fused with other metals. The additional labor involved caused him to follow up the line of the fault. Suddenly the flame of the lamp began to flicker in a draught. There was an air-passage between cave and ledge.
Pressure on the thoracic veins and on the air-passage causes cyanosis and dyspnœa. When the œsophagus is pressed upon, the patient may have difficulty in swallowing.
Why, one minor injury to the throat would be certain to damage that passage beyond repair, and bring death. Yet such relatively unimportant things as ears, and eyes are doubled. Surely you would expect that so important a member as the air-passage would be doubled for safety. "Those strange, awkward arms and legs were what puzzled me.
Let us now examine some of these other products. Here is an experiment which I think will help you in part in this way. We will put our candle there, and place over it a chimney, thus. I think my candle will go on burning, because the air-passage is open at the bottom and the top. In the first place, you see the moisture appearing that you know about.
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