Copy letter from Robert William Frederick Harrison, to Professor Alfred George Greenhill, Fellow of the Royal Society The printers have informed Harrison, in relation to the printing of equation numbers on Greenhill's paper, that removing the "leaders" would cost one pound and eight shillings. This would leave four pounds and 17 shillings for Greenhill's share of the cost, if he wishes to have the numbers shifted from right to left at his expense. Harrison asks to be informed of Greenhill's final decision. 8 June 1904