Item 4 - Copy of letter from Huia Onslow to Frederick W. Fletcher

Has delayed replying until he heard from Professor Hopkins: cannot accept Fletcher's offer, as he 'could never obtain a licence to do vivisection and to keep animals that have been operated on... The Home Office will not allow private house to be licenced'. This would 'cut him off' from 'one of the most fruitful channels of research'. Also, since he cannot attend laboratories, he often has to wait to obtain desired material or for 'some lengthy reaction' to be completed; currently, he has been able to turn to another problem but would not be able to do so knowing Fletcher was 'anxiously awaiting practical results'. Professor Hopkins assures him the 'anxiety to produce practical results... does not lead to satisfactory work'. Thinks Fletcher should give money to 'some well known institute such as the Imperial Cancer Research Fund' if he requires a 'direct return.... in the form of the relief of cancer'. However, believes he could do some 'indirect biological work' which 'might prove fruitful'. Gives examples arising from his work on pigmentation, or 'devising of the method for the estimation say of nitrogen in the urine'.