Potions

Potions is described as the art of creating mixtures with magical effects. It requires the correct mixing and stirring of ingredients at the right times and temperatures. "Potions seems, on the face of it, to be the most Muggle-friendly subject. But there does come a point in which you need do more than stir." Snape serves as Potions master from Philosopher's Stone to the end of Order of the Phoenix. Snape's lessons are depicted as unhappy, oppressing times set in a gloomy dungeon in the basement of the castle. In Half-Blood Prince, Horace Slughorn replaces Snape as Potions instructor.