That's an event in "Tess of the d'Urbervilles": a cow at a dairy has eaten some wild garlic and the entire batch of milk is ruined. Everyone has to go out and w

That's an event in "Tess of the d'Urbervilles": a cow at a dairy has eaten some wild garlic and the entire batch of milk is ruined. Everyone has to go out and walk the fields in a line to root out any garlic they come across. Full disclosure: I never finished the book (my attention wandered elsewhere), but I did get as far as this scene. ETA: Around this part of the book the words "hagrid" and "dumbledore" appear, suggesting J.K. Rowling was reading this around when she named the characters in Harry Potter.