Copy letter from Herbert Rix, to Professor John Gray McKendrick, Fellow of the Royal Society, 2 Florentine Gardens, Glasgow 'Dear Sir, Inclosed herewith I send you (in accordance with your request received this morning) cheque for £15 to aid Mr. Jack in his researches on Muscular Motion, a grant from the Royal Society's Donation Fund. Have the goodness to send me formal receipt for the same. Yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 6 November 1893