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A
swift inspiration came to me, and I merely dropped my own
sou into the bag and slid the silver coin into my pocket.

Word:

bird

Question:

How does the swift inspiration lead the speaker to put their soul into the bag?

Answer (optional):

The swift inspiration led the speaker to put their soul into the bag when they decided to drop their own two-franc piece into the collection-bag and slide the English lady's coin into their pocket, thus withdrawing Laploshka's two francs from the poor.