What are the different laws of magic (e.g. Golpalott's Third Law) mentioned in the Harry Potter universe?
No movie answers, but Pottermore is fine.
What are the different laws of magic (e.g. Golpalott's Third Law) mentioned in the Harry Potter universe?
No movie answers, but Pottermore is fine.
There are only three mentioned in the (ten) books.
"Your mother can’t produce food out of thin air," said Hermione. "No one can. Food is the first of the five Principal Exceptions to Gamp’s Law of Elemental Transfigur—"
"Oh, speak English, can’t you?" Ron said, prising a fishbone out from between his teeth.
"It’s impossible to make good food out of nothing! You can Summon it if you know where it is, you can transform it, you can increase the quantity if you’ve already got some —"-- HP and the Deathly Hallows, chapter 15: The Goblin's Revenge
Further discussion here.
Hermione recited at top speed: "Golpalott's-Third-Law-states-that-the-antidote-for-a-blended-poison-will-be-equal-to-more-than-the-sum-of-the-antidotes-for-each-of-the-separate-components."
-- HP and the Half-Blood Prince, chapter 18: Birthday Surprises
Further discussion here.
"Tamper with the deepest mysteries — the source of life, the essence of self — only if prepared for consequences of the most extreme and dangerous kind."
-- The Tales of Beedle the Bard
Pottermore doesn't seem to have any further information on the laws of magic, at least at present.
Miranda Goshawk's Book of Spells also refers to a fourth (thanks @ibid for the find):
Of course, creating any living creature out of thin air is immensely difficult. This spellbook is concerned with practical instruction, and not with theory; but your teacher will be able to explain the Principle of Artificianimate Quasi-Dominance, which will help you understand some of the many things that can go wrong when attempting to conjure animals from nothing. Severed heads, unidentifiable stumps, terrifying frog-rabbit mutations – all have been created, to the dismay of those who made them (and the horror of those who found them hidden under cushions). However, for reasons that are still not fully understood (research continues in the Dept. of Mysteries in the Ministry of Magic) two categories of creature are much easier to create from nothing than any other: birds and snakes.
-- Book of Spells