To Daniel Oliver   [after 14 April 1863]¹

Dear Oliver

Many thanks about the Primula: I see that I was pretty right about the ovules.² I have been thinking that the apparent opening at the chalaza end must have been withering or perhaps gnawing by some very minute insects, as the ovarium is open at the upper end. If I have time I will have another look at pollen-tubes, as from what you say they ought to find their way to the microphyle. But ovules to me are far more troublesome to dissect than animal tissue; they are so soft, and muddy the water.

With many thanks | Yours very sincerely, | C. Darwin