Kindly let me have separate estimates (1) for the spectrum marked "A", (2) for the other spectra; to be reproduced in the same manner as the spectra which you did for Mr Lockyer last autumn. They are to be folding plates in our "Philosophical Transactions" ['Philosophical Transactions of the Royal Society'] (4to, [quarto]), and are not to be reduced.
Asst. Sec. R.S. [Assistant Secretary, Royal Society]'.