"coming through the rye, poor body, coming through the rye"
When a child is singing Robert Burns' song, Holden, the main character in Salinger's novel, must have put himself into the image that the poem describes, a poor body, coming through the rye. He must think the poor body is tired, lonely, lost, and confused. It has been such a hardship for Holden. He was kicked out of three schools, runs away from school, has difficulties in school, cannot communication with anybody, and cannot relate to his peers. Nobody understands what he's trying to say. Adults won't listen to him. His father is going to kill him. The dishonest, unfair, ugly relationship that he see in people, elevator boy, tax driver and etc. disturb him, he is getting drunk at 16. He lies and is perpetually lonely throughout the entire novel. He even hired a prostitute whom he doesn't know and get beat up. He is as miserable as that poor body in the poem.
"She draigled her petticaotie"
It is heavy, wet, gloomy and depressing. The sentence sense exactly how Holden felt about himself and people around himself. He is depressed and cannot barely walk through