The Difference Between Melancholy and Depression

i was wondering if you cold talk about that a little because i know that that's a really important part of the book. And it seems like, psychologically, our culture doesn't distinguish between melancholy, or even sorrow, and depression - they're completely frent and distinct states. I have the same fear of of being misunderstood that i had with quiet in that way. By i think these are differences of degree, and that the differences of degree are so meaningful a as to effectively be differences of kind.