"Heartache" is "Misery"
"The Chameleon" is about a dog and wondering if it is a stray or the General's dog. Opinions change on what to do with the dog depending on the owner. This is humorous.
"The Culprit" is about a guy who unbolts parts of passenger trains so he can use the nut as a weight for fishing. Apparently it was a common practice. He's arrested and sent to hard labor. It left me puzzled, but I can see the story as a humorous piece if one is in the right mood.
I didn't particularly like "A Calamity" although the details were interesting. It was a story of adultery out of boredom as you mentioned.
That leaves in the short list:
The Letter
The Name-Day Party
Anna on the Neck
About Love
The Darling
The Lady With the Pet Dog
At Christmas Time