Question

What is the meaning of line like bottle bits on stones

Answer 1

This phrase from 'An Elementary School Classroom in a Slum' describes the piteous, miserable, and pathetic condition of the slum children. They are so weak that their bones are visible inside their thin, undernourished skin. They are looked at by indifferent people and government authorities who appear to be wearing spectacles whose glasses (lenses) are mended (not allowing clear sight of the plight of the slum children).