Writing a Scientific Paper. Fourth edition: By Vernon Booth. Pp. 28. The Biochemical Society, London, 1977, Orders, together with remittance to The Biochemical Society Book Depot, P.O. Box 32, Colchester, CO2 8HP, Essex, U.K. £1.00 or $2.00 (postage included). (Discounts on bulk orders: 11–20 copies, 10%; 21–30, 20%; 31–50, 30% and 51 or more, 40%