There are two kinds of horror stories: experiments about mad scientists and ferocious monsters  In the horror stories about monsters, monsters symbolize the psychological confusion of the protagonist  The horror stories about mad scientists typically express the author's feelings: scientific knowledge alone is not enough to guide human exploration
Despite these differences, these two types of horror stories have the following characteristics in common: they describe phenomena that go against the laws of nature: they both want to frighten the reader
Most of the stories about mad scientists express the author's anti-scientific views