As the poison paralyzed the “heart,” the ups and downs of the graph flattened out into a horizontal line halfway between the extremes of undulation. But so long as any life remained in the plant, this medial line did not run level, but was jagged with sharp irregular ups and downs that represented in a visible symbol the spasms of a murdered creature desperately struggling for life. After a little while, there were no more ups and downs. The line of dots was quite straight. The plant was dead. The spectacle of a dying animal affects us painfully; we can see its struggles and, sympathetically,
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