I have struck as fair a balance as our knowledge permits.
It is wonderful to me that you have patience to read my slips, and I cannot but regret, as they are so imperfect; they must, I think, give you a wrong impression, and had I sternly refused, you would perhaps have thought better of my book.

Every single slip is greatly altered, and I hope improved.
With respect to the human ovule, I cannot find dimensions given, though I have often seen the statement.

My impression is that it would be just or barely visible if placed on a clear piece of glass.

Huxley could answer your question at once.
I have not been well of late, and have made slow progress, but I think my book will be finished by the middle of November.
LETTER 218.

A.R.WALLACE TO CHARLES DARWIN.