uncouth rivets!

There is a passage about rivets on page 30. Marow is talking to the foreman (the boiler maker) about how they shall have rivets. The foreman expresses disbelief... and then Marlow says "instead of rivets there came an invasion, an infection, a visitation." He then describes the invasion in somewhat of a pretentious way; talking about the appearances of the people. Using the word "invasion" is comparing the native to animals yet again. " four such installments came, with their absurd air of disorderly flight" is speaking to yet again the idea of colonization. Marlow is repeatedly reinforcing the idea of the natives being uncouth and untamed- they are disorderly and uneducated, which is why he is repeatedly comparing them to animals. Though the deal with the rivets began several pages earlier, it can also be used to instill the sense of un-civilization- the lack of something as mundane and commonplace as a rivet can be a lack of "civilization" in a way.