Letter from James Wilfred Cook, on a paper 'The growth-inhibitory and carcinogenic properties of 4-aminostilbene and derivatives' by Alexander Haddow, R J C Harris, George Armand Robert Kon and E M F Roe to the Assistant Secretary of the Royal Society The authors have taken note of his previous criticisms. Some parts have been compressed and other completely re-written. [Published in Philosophical Transactions A, 1948]. Endorsed on recto as received 18 February 1948. 16 February 1948