Foreshadowing

"Alas! I did not yet entirely know the fatal effects of this miserable deformity." - pg. 80

Once the creature begins to narrate, Mary Shelley creates a sense that the worst is yet to come. We know the outcome of most of the story, because of the scene on the dog sleds; however, we don't know how any of that comes about. The fact that the creature mentions "fatal" effects shows that something is bound to go terribly wrong. Why else would Frankenstein go chasing after him in a dog sled in the arctic? Foreshadowing is used to show that things with the creature and his creator don't get any easier. Just because Victor is listening to the story doesn't mean that anything will change. Maybe he'll still want to kill the creature? Maybe the creature will kill Victor? That's the bad thing about foreshadowing - it puts lots of "could-be" scenarios into a reader's head. I guess that's why Mary Shelley decided to use it in a creepy, sci-fi book.