The stones symbolize murder and death because that's what the people used to kill Mrs. Hutchinson.
In the line, "The flowers were blossoming profusely", you can almost imagine what the flowers look like and what they smell like on a warm sunny day.
Symbolism: Black Dot
"Soft laughter ran thoroughly through the crowd" is an example of Personification because it gives laughter the human trait of running.
The Themes of this story is "Not everything is how it seems and winning can come with consequences". The title of this story suggests that they will win something from the lottery, but really when they won, they were stoned to death.
The Black Dot symbolizes the selection. Whoever got the black dot would be the person who won. Then they would get stoned to death.