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Your edits to Underground Chambers
Please stop renaming the page "Underground Chambers" to "Philosopher's Stone chambers". "Underground Chambers" is the highest canon official name, being the one used on Pottermore, whereas I'm not even sure that "Philosopher's Stone chambers" is ever used in canon. -- 1337star (Drop me a line!) 19:15, December 19, 2014 (UTC)
RE:THE POLYJUICE POTION
Fifty school years before the 1992-1993 school year, gives us the 1942-1943 school year. If Myrtle was killed in June (which we know directly from the book), then it took place in the second half of that school year, i.e. in 1943. --16:18, February 26, 2015 (UTC)