In reply to your note of the 13th., on the recommendation of Prof. [Professor] Greenhill I send you our copy of Carnot's Metaphysics of the Infinitesimal Analysis, and trust that I may rely upon you to return it as speedily as possible, and, in any case, not to exceed the prescribed period of one month.
I am, yours faithfully,
Asst. Sec. R.S. [Assistant Secretary, Royal Society]'.