Daylight began to forsake the red-room; it was past four o'clock, and the beclouded afternoon was tending to drear twilight. I heard the rain still beating continuously on the staircase window, and the wind howling in the grove behind the hall; I grew by degrees cold as a stone, and then my courage sank. My habitual mood of humiliation, self-doubt, forlorn depression, fell damp on the embers of my decaying ire. All said I was wicked, and perhaps I might be so; what thought had I been but just conceiving of starving myself to death? That certainly was a crime: and was I fit to die? Or was the vault under the chancel of Gateshead Church an inviting bourne? In such vault I had been told did Mr. Reed lie buried; and led by this thought to recall his idea, I dwelt on it with gathering dread.
The highlighted punctuation (after "I might be so") is a semi-colon in Gutenberg eBook, and a colon in Penguin Books. Which is right, or more proper in the context?