Material on the floor of a house that goes from how to goes from wall to wall​

Which three sentences in this excerpt from arthur conan doyle's "the contest" suggest that the author's tone is mocking?

In the book hatchet why did brian think searchers would not find him

Ead this sentence from the evolution of useful things. the underlined phrases indicateaaking waterproof sandpaper would allow wet sanding, which in turn would cut down on dust, and thus be a greatmprovementpassing of timea directional change of positiona cause-and-effect relationshipsequence of events. save and exitmark this and retur