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Magical Theory

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"All you will ever need to know about what makes spells work."
—Advert at Flourish and Blotts[src]

Magical Theory written by Adalbert Waffling is a required textboox for first year at Hogwarts.[1] It is available at the Hogwarts Library, or for sale at Flourish and Blotts bookstore for two Galleons.[2]

Known Contents

In a chapter speaking of the first fundamental law of magic:

Tamper with the deepest mysteries - the source of life, the essence of self - only if prepared for consequences of the most extreme an dangerous kind.


During the 1991-1992 school year, a Gryffindor student lost her/his copy of Magical Theory on the Hogwarts grounds and posted a notice requesting its return on the Gryffindor pasteboard. Harry Potter found it near Hagrid's Hut and returned it to the student, receiving a Chocolate Frog Card depicting Mopsus for his trouble.[3]

Hermione Granger owns it, usually storing it in her school trunk.

Behind the scenes


Notes and references

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