Letter from Edward Wilfred Taylor, on a paper 'Phase contrast and interference microscopy' by R C Faust, to D C Martin, assistant secretary of the Royal Society Paper reference code: A137 Taylor is honoured to be asked to referee Faust's paper, however he lacks the time and 'competence' for a complete mathematical check. Requests permission for his mathematical assistant, Dr P M Barham to undertake the checking, or suggests the appointment of a mathematician to act as a joint referee with him, or a new referee to take on the whole task. Written at Cooke, Troughton & Simms Ltd, Mathematical & Optical Instrument Makers, Haxby Road, York [England]. [Published in Proceedings A, 1952]. Endorsed on recto as received 18 July 1951. 16 July 1951