In one of the laboratories we were shown the instrument which records the beating of a plant's "heart" . . . . (The) minute pulsations which occur in the layer of tissue immeidately beneath the outer rind of the stem, are magnified--literally millions of times--and recorded in a dotted graph on a moving sheet of smoked glass . . . . A grain of caffeine or of camphor affects the plant's "heart" in exctly the same wy as it affects the heart of an animal. The stimulant was added tot he plant's water, and almost immediately the undulations of the graph lengthened out under our eyes and, at the same time, came closer together: the pulse of the plant's "heart" had become more violent and more rapid. After the pick-me-up we andministered poison. A mortal dose of chloroform .... The graph became the record of a death agony. As the poison paralysed the "heart", the ups and downs of the graph flattened out into a horizontal line half-way 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 panfully; we can see its struggles and, sympathetically, feel something of its pain. The unseen agony of a plant leaves us indifferent. To a being with eyes a million times more sensitive than ours, the struggles of a dying plant would be visible and therefore distressing ... The poison flower manifestly writhes before us. The last moments are so distressingly like those of a man, that we are shocked by the very spectacle of them into a hitherto unfelt sympathy.
Sensitive souls, whom a visit to the slaughterhouse has converted to vegetarianism, will be advised, if they do not want to have their menu further reduced, to keep clear of the Bose Institute. After watching the murder of a plant, they will probably want to confine themselves to a strictly mineral diet. But the new self-denial woudl be as vain as the old. (176-178)