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Updated: June 5, 2025
A few minutes later I violently exploded an air-filled paper bag on the landing, and gave a stage moan that could have been heard in the cellars. Then I pursued my original intention and went to bed.
To put it more precisely, the lung of the quadrupeds retains this hereditary growth-process of the fishes; for the hydrostatic floating bladder of the latter is the air-filled organ from which the air-breathing organ of the former has been evolved. There is an interesting cenogenetic phenomenon in the formation of the heart of the higher Vertebrates that deserves special notice.
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