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- Spectrum analysis of the black powder points unmistakably to the presence of an unknown element with a brilliant group of three lines in the green, and it is possible that it combines with argon to form a compound which acts at once with deadly effect upon some constituent in the blood.2.10 — Book 2 Chapter 10 — The Epilogue (20% in)
There are no more uses of "constituent" in The War of the Worlds.
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