Walden help!

[Fluff]

What's the purpose of the "allusion ay! There was the rub" Thoreau makes in chapter 6 of walden and why does he make the allusion to Cerberus in the same chapter. Why have a 3 headed dog guard the mans house?

[Calidore]

Why not just read the book? It's relatively short (<>200 pages in paperback) and in the public domain to boot. Here's a link to a freebie:

http://www.gutenberg.org/ebooks/205