It's important to note that there are actually two prefaces to *Frankenstein*.
* První předmluva napsala Mary Shelley a zahrnuto do edice z roku 1818 románu. It provides context for the story and explains how it came to be written.
* Druhá předmluva napsal Percy Bysshe Shelley (Mary's husband) and included in the 1831 edition . It focuses on the philosophical and ethical aspects of the novel.