Copy letter from Robert William Frederick Harrison to J [John] H [Hilton] Grace FRS, Peterhouse, Cambridge
'Dear Sir,
In reply to your letter of July 30, Sir Joseph Larmor says we are bound to charge Trade price for the 50 copies of the Biography of Lord Kelvin. The price will therefore be
50 @ 4/- £10
Less 25 percent
2.10
£7.10
The copies were forwarded to you on Tuesday and I trust arrived safely.'
6 August 1909