Copy letter from Robert William Frederick Harrison to Mr A Fraser, 22 Tevit Place, Edinburgh 'Will you please send the following to Miss Muriel Robertson at the Sleeping Sickness Laboratory, Mpumu, Uganda: (1) a gross of specimen tubes 1 and a half by 1 and a quarter inch with parafind corks. (2) 4 oz of No. 1 coverslip squares three quarters by three quarters or seven eighths by seven eighths packed in alcohol. The account should be sent here for transmission to the Colonial Office for payment.' 17 April 1912