Final answer:
The words 'final disposition of the organ' create a mysterious tone in the excerpt.
Step-by-step explanation:
The words 'final disposition of the organ' impact the tone of the excerpt by creating a mysterious tone. The phrase suggests that there is uncertainty surrounding what happened to Julia's heart. This uncertainty adds intrigue to the situation and leaves room for speculation. The author's indifference towards the fate of the organ also contributes to the mysterious tone.
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