Copy letter from an unknown correspondent, to the Cambridge Instrument Company, St Tibb's Row 'Dr Foster writes me that Mr Oldfield Thomas's plate may be put in hand. I enclose the sketch-plate herewith. I believe you have already been in correspondence with Mr Thomas, & that the drawing on the stone is to be done from the specimens. Your estimate £9-15-0 is accepted. When you are writing kindly let me know by about what date the proof of plate is likely to be ready'. 21 May 1889