In answer to yours of April 26, I do not think it would be fair to charge you with the extra copies. The case is of course a little exceptional. Harrisons ought not, by right, to have included Mr Darwin's paper in your separate copies. I am now instructing them to charge the 19/6 [£19 and 6 shillings] to the Society.
I am, yours faithfully,
Asst Sec [Assistant Secretary, Royal Society]'.