Twotall

Corrected entry: In the chapter "Horace Slughorn", in the house Harry sees 'something darkly red and gluttonous,' which is later described as dragon's blood. However in the fifth book, the chapter "Hagrid's Tale", Hagrid uses dragon meat on his wounds, but it says that the meat oozed 'greenish blood'.

Correction: There's nothing in the series to suggest all dragons have similar blood. The blood of a Welsh Green might very well be green, while the blood of a Noregian Ridgeback is red, or blue, or black. We just don't know either way.

Twotall

Corrected entry: In this book, during the end, Snape says that he is the Half-Blood Prince. Earlier, when Harry is at the Weasley's for Christmas, he wonders if his dad was the Prince. He looks in the book, and it says that the book was from fifty years ago. He is depressed by the fact that his dad wasn't at Hogwarts fifty years ago. In the fifth book, when Harry is in Snape's pensieve, he sees his dad and Snape finish their O.W.L.s. This would mean that they were in the same year at Hogwarts.

Correction: When Harry first wonders about if the book belonged to James Potter, it is under the assumption that the Prince had owned the book when it was new. But as we later find out, poor students (such as Snape) can get cheap, used books through a special fund at Hogwart's. It is therefore quite possible that Snape had a ten-year old copy of the book at the time when he dubbed himself the Half-Blood Prince.

Twotall

The book could have belonged to Snape's mother, Eileen Prince. Snape could have borrowed her books.

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