Web scraping a specific part

I'm trying to get a specific part of this websites html code: https://en.wikisource.org/wiki/Animal_Life_and_the_World_of_Nature/1903/06/Notes_and_Comments

By using this code:

List1 = Soup.find("div", class_="prp-pages-output")

But when I try to print List1 I get this: None

Why is this happening?