The kids with the stones could possibly foreshadow that someone might get stoned. In the beginning they are just playing around with the stones, you dont really suspect that someone could be stoned. "Bobby Martin had already stuffed his pockets full of stones, and the other boys soon followed his example, selecting the smoothest and roundest stones" lines 15-18
Tone and Theme
The Blox blox symbolizes Death. It also symbolizes the fate the of the name of the person on the paper. Everyone is fearful of the black box because if their name gets pulled it means death. "..No one liked to upset as much tradition as was represented by the black box." lines 58-59.
The way the passage describes the flowers and grass gives the reader a vivid image while they read. The reader being able to imagine the secenrio can help the reader determine the mood or tone. "The flowers were blossoming profusely and the grass was richly green>" lines 2-3