We shall be able to find suitable space for your pictures, hanging them 3 deep, or perhaps 4 deep, if necessary, as our viewing space is limited. Please do not fail to come early on the afternoon of the 6th if you cannot come before that date. We shall send you a proof of your exhibit title, so kindly let us know, if you will, where it may be sent, say, for next week.
Yrs [Yours] faithfully,
Asst Sec RS [Assistant Secretary, Royal Society]'.