''Wow, a strong accent you have there, Miss Robbins. Now, the two of you will suffice. Lesson follows. Full Transfiguration, also called Correct Transfiguration, is the ability to fully transfigure something. It is, what we call, a successful transfiguration. When you point your wand at a box, for example, and try to transfigure it into a bird, for example, you utter a spell. If, as a result of that spell, you get a full bird, without any bird-like traits, you have managed to produce a Full Transfiguration.
Partial Transfiguration is different and can present itself in two forms. It is, what we call, an unsuccessful transfiguration, when one does not managed to transfigure an object fully. Now, let us say we want to return that bird back into the box. We utter a spell, but what is the result? There are two options, if we do not manage to succeed. Firstly, the box could have some bird-like traits, for example wings or a beak. That is the situation with, what I like to call, left-overs. The transfigured object still has some traits of the original object, but it also has some traits of itself. The second option is when we try that same spell but we get what? A bird shaped like a box. That is the type of partial transfiguration when the original objects stays the same, but takes the shape of the transfigured object.
And that concludes the lesson. Short but informative. For your homework, which is due to our next class, you will transfigure two objects of your desire into whatever you desire. One of them will be a full transfiguration, and the other a partial. Try it and then bring it to me on our next class. And to not try to cheat, I can easily check if the object had been hexed. Class dismissed.'', McCoy said.