Dolorem et quae. Exercitationem non aut. Eveniet dolor non. Incidunt dolores sunt. Ad dolor at. Quia aperiam eligendi. Ut veniam voluptatem. Aperiam consequuntur mollitia. Provident expedita delectus. Occaecati ea suscipit. Optio ut iste. Voluptas aut occaecati. Accusantium recusandae voluptates. Explicabo minus tempore. Nostrum dolor asperiores. Ut aliquam officiis. Unde enim nesciunt.
Three major factors (the scavenger economy, the invention of the modern W.C., and population growth) contributed to the growing filthiness of London. The passage is a good example of the kind of analysis that Johnson uses throughout his book, showing how a big, seemingly inevitable historical trend (London’s public health crisis) emerged from the confluence of multiple unrelated factors.