Question

dr. jekyll and mr. hyde, chapters 7 and 8
\quite so, sir,\ returned poole. \well, when that masked thing like a monkey jumped from among the chemicals and whipped into the cabinet, it went down my spine like ice. o, i know its not evidence, mr. utterson, im book - learned enough for that, but a man has his feelings, and i give you my bible - word it was mr. hyde!\ - the strange case of dr jekyll and mr hyde, robert louis stevenson
case of dr. jekyll and mr.
chapters 7 and 8
stevenson

Explanation:

This passage from "The Strange Case of Dr. Jekyll and Mr. Hyde" shows Poole's intuitive suspicion that the masked figure is Mr. Hyde, highlighting the theme of the duality of human nature and the fear of the unknown within the character. The fear - like a chill down the spine - emphasizes the mysterious and menacing nature of Hyde.

Answer:

The theme of the duality of human nature and the fear of the unknown.