The meaning of the prefix im- or in- is not, or opposite of.
For example:
possible - impossible
Answer:
The sublime being the “echo of a great soul” (36), in Dr Jekyll case it is his evil soul. When he is Hyde, he is not conscious of Jekyll anymore; he is in another altered state of mind that is associated with the sublime feelings of obscurity and power
Explanation:
Foreshadowing that hints at what's coming next.
