How we cite our quotes: Collins doesn't use traditional chapters in The Moonstone, so the citations are a little trickier than in other Victorian novels. Citations follow this format: (Period.Narrative.Chapter.Paragraph).
Quote #7
I am to keep strictly within the limits of my own experience, and am not to inform you of what other persons told me—for the very sufficient reason that you are to have the information from those other persons themselves, at first hand. In this matter of the Moonstone the plan is, not to present reports, but to produce witnesses. I picture to myself a member of the family reading these pages fifty years hence. Lord! what a compliment he will feel it, to be asked to take nothing on hearsay, and to be treated in all respects like a Judge on the bench. (1.1.23.66)
Betteredge is imagining how the novel will be read later on. He reminds us that the narratives we're reading are not only true, but presented as "evidence," as though the reader were a "Judge on the bench."
Quote #8
*Note. Added by Franklin Blake.—Miss Clack may make her mind quite easy on this point. Nothing will be added, altered, or removed, in her manuscript, or in any of the other manuscripts which pass through my hands. Whatever opinions any of the writers may express, whatever peculiarities of treatment may mark, and perhaps in a literary sense, disfigure, the narratives which I am now collecting, not a line will be tampered with anywhere, from first to last. [2.1.1.6 (footnote)]
Wilkie Collins, through the voice of Franklin Blake, the fictional editor, reminds the reader that the narratives we're reading have not been changed at all. Everything we read, even the poorly written or ridiculous narrative of Miss Clack, is printed just as they were originally written. Of course, we know that the whole book is fictional, so this footnote is just Wilkie Collins winking at the reader and pretending that we don't know that it's fiction.
Quote #9
The name of the firm is accidentally blotted in my diary, and my sacred regard for truth forbids me to hazard a guess in a matter of this kind. (2.1.1.16)
Miss Clack wants to emphasize to the reader that her narrative is 100% accurate. Everything that she writes comes out of the diary she was keeping at the time. The "blot" in her diary is Wilkie Collins's way of reminding us that there are reliable sources for everything in this narrative. Even if Miss Clack's way of presenting it is biased, the basic facts are all true.