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Although of course I am aware that it changes colour in a jar. But we know why, surely? The heavier melancholic elements in the blood sink, making the top lighter and the bottom darker.””Not so,” I said firmly. “Cover the jar, and the colour does not change. And I can find no explanation of how such separation could occur in the lungs. But when it emerges from the lungs – at least, this is the case in cats – it is very much lighter in colour than when it goes in, indicating that some darkness is withdrawn from it.””I must cut up a cat and see for myself. A live cat, was it?””It was for a while.
