Since I don’t do TV and with the coming of the last installment of Harry Potter and the Deathly Hallows, I have taken to re-reading the entire Harry Potter series; however, this time around, I am focusing my attention on one of my favorite characters, Severus Snape.

On 6/15/2011, I finished reading Harry Potter and the Sorcerer’s Stone for likely the 6th or 7th time. If my calculations are correct, Snape’s name is referenced 174 times in the Sorcerer’s Stone. I created an index of pages in which Snape is mentioned and took notes about various passages that I feel add to his character…for my “I Trust Snape” campaign. For reference purposes, my book is an American edition hardcover, October 1998.
Snape is referenced on the following pages: 126, 130, 135, 136-141, 152, 173, 174, 177, 181-183, 190, 191-193, 194, 196, 198, 207, 212, 216, 217, 220-228, 232, 240, 246-247, 260, 263-264, 266-270, 275, 278, 283-284, 287-290, 299, 300, and 306.  
An interesting reference on page 221: 
“Could Snape possibly know they’d found out about the Sorcerer’s Stone? Harry didn’t see how he could — yet he sometimes had the horrible feeling that Snape could read minds.”
(I had completely forgotten that Rowling referenced this in the first book!)
I Trust Snape
Pages 288 – 289: 

“But I thought — Snape –”

“Severus?” Quirell laughed, it wasn’t his usual quivering treble , either, but cold and sharp. “Yes, Severus does seem the type, doesn’t he? So useful to have him swooping around like an overgrown bat. Next to him, who would suspect p-p-poor, st-stuttering P- Professor Quirrell?”

Harry couldn’t take it in. This couldn’t be true, it couldn’t.

“But Snape tried to kill me!”

“No, no, no. I tried to kill you. Your friend Miss Granger accidentally knocked me over as she rushed to set fire upon Snape at that Quiddich match. She broke my eye contact with you. Another few seconds and I’d have got you off that broom. I’d have managed it before then if Snape hadn’t been muttering a countercurse, trying to save you.”

“Snape was trying to save me?”

“Of course,” said Quirrell coolly. “Why do you think he wanted to referee your next match? He was trying to make sure I didn’t do it again. Funny, really…he needn’t have bothered. I couldn’t do anything with Dumbledore watching. All the other teachers thought Snape was trying to stop Gryffindor from winning, he did make himself unpopular…”

On page 290:

“But Snape always seemed to hate me so much.”

“Oh, he does,” said Quirrell causally, “heavens, yes. He was at Hogwarts with your father, didn’t you know? They loathed each other. But he never wanted you dead.”

The Snape-Potter conversation is continued, with Dumbledore, when Harry is in the hospital wing. Page 300:

“Yes, him — Quirrell said he hates me because he hated my father. Is that true?”

“Well, they did rather detest each other. Not unlike yourself and Mr. Malfoy. And then, your

father did something Snape could never forgive.”

“What?”

“He saved his life.”

What?

“Yes…” said Dumbledore dreamily. “Funny, the way people’s minds work, isn’t it? Professor Snape couldn’t bear being in your father’s debt…I do believe he worked so hard to protect you this year because he felt that would make him and your father even. Then he could go back to hating your father’s memory in peace…”