what is the interal conflict developed in chapter 16?

The internal conflict comes with his helping Jim escape. He's breaking the law, and he's assisting someone else's property to freedom. It tugs at his conscience.

"Well, I can

tell you it made me all over trembly and feverish, too,

to hear him, because I begun to get it through my

head that he WAS most free -- and who was to blame

for it? Why, ME. I couldn't get that out of my con-

science, no how nor no way. It got to troubling me

so I couldn't rest; I couldn't stay still in one place.

It hadn't ever come home to me before, what this

thing was that I was doing. But now it did; and it

stayed with me, and scorched me more and more. I

tried to make out to myself that I warn't to blame,

because I didn't run Jim off from his rightful owner;

but it warn't no use, conscience up and says, every

time, "But you knowed he was running for his free-

dom, and you could a paddled ashore and told some-

body." That was so -- I couldn't get around that

noway. That was where it pinched. Conscience says

to me, "What had poor Miss Watson done to you

that you could see her nigger go off right under your

eyes and never say one single word?"