check out our:
"He [Marlow's white companion] was very anxious for me to kill somebody, but there wasn't the shadow of a carrier near. I remembered the old doctor—'It would be interesting for science to watch the mental changes of individuals, on the spot.' I felt I was becoming scientifically interesting." (1.50)
Both Marlow's companion and Marlow himself find themselves going mad because the white friend has obviously been attacked. He wants Marlow to kill the assaulters, but there is nobody around. Marlow jokes that because his world no longer makes sense, he is becoming "scientifically interesting."
"I went to work the next day, turning, so to speak, my back on that station. In that way only it seemed to me I could keep my hold on the redeeming facts of life. Still, one must look about sometimes; and then I saw this station, these men strolling aimlessly about in the sunshine of the yard. I asked myself sometimes what it all meant. They wandered here and there with their absurd long staves in their hands, like a lot of faithless pilgrims bewitched inside a rotten fence […] I've never seen anything so unreal in my life." (1.54)
Marlow convinces himself that the only way he can remain sane is to work by himself, obsessing about fixing the steamboat. However, he finds himself sneaking peeks at his fellow men and discovering that everything is as absurd as he'd feared. The men are so aimless that Marlow compares them to pilgrims who have lost their faith or been bewitched. He seems to hate their aimlessness because it contradicts so sharply with his keen sense of purpose.
"I was smoking my pipe quietly by my dismantled steamer, and saw them all cutting capers in the light, with their arms lifted high, when the stout man with moustaches came tearing down to the river, a tin pail in his hand, assured me that everybody was 'behaving splendidly, splendidly,' dipped about a quart of water and tore back again. I noticed there was a hole in the bottom of his pail." (1.55)
A man with a broken pail is trying to put out the fire: yep, we're thinking this is symbolic. He's the only one who seems to care about the fire, but—in the context of this scene—trying to put it out seems insane.