|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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- "Has either of you seen my copy of Numerology and Grammatica?"
- —Hermione Granger's search for her textbook[src]
In 1997, Hermione considered this book as she was sorting supplies for their mission to find Voldemort's Horcruxes. Apparently, it was useless for what they were about to set out and do, so she decided to leave the book behind.
Behind the scenes
- In the Harry Potter films, this book appears to actually be two separate, though visually similar, books: Numerology, by L. Wakefield; and Grammatica, by M. Carneiro.
|Professors: Septima Vector|
|Known Arithmancers: Bridget Wenlock|
|Textbooks: Numerology and Grammatica · New Theory of Numerology|
|Arithmancy at Hogwarts: Arithmancy (class) · Classroom 7A · Advanced Arithmancy Studies|