Letter from Howard Walter Florey to J S K Boyd Says they are trying to purify secretin - an American Rhodes Scholar has elaborated quick test which seems quite quantitative for secretin - Abraham and Newton have undertaken to look into the possible separation of the relatively crude material in the Craig counter-current apparatus - discusses this and the difficulty of preparing sufficient of the final crude preparation - not prepared to say that secretin will be of medical value - says the preparation of secretin on the market, Mebiol, is considerably weaker than the methanol extract obtained in step 4 of their extraction procedure - asks if Boyd's associates (Wellcome Foundation) could help with the production of 100gm of methanol extract or if he could suggest someone who might help - comments on this. 26 September 1955