It is impossible to know if your version of the book has the same page numbers as mine. In mine, pages 157 through 166 have to do with the state of hygiene in the United States in the early 1800s.
The basic idea of this section of the book is that America was a disgustingly dirty place by our current standards. This section talks about things like how the streets of cities were covered with horse manure and often had pigs running around eating garbage. Everyone, of course, had to use privies as there were no toilets. This section mentions that in many places men would simply urinate against the sides of buildings.
By the end of the time period the book covers, people were starting to bathe more, though. This happened as people started to have washbasins and pitchers and houses big enough to have their own rooms. This let them actually wash themselves more or less in private.
Overall, the point of these pages (in my edition of the book, at least) is that America was not a very hygienic place in those days.