Principles and practice of research: Strategies for surgical investigators. 2nd ed. H. Troidl, W. O. Spitzer, D. S. Mulder, A. S. Wechsler, B. McPeek, M. F. McKneally and C. M. Balch, eds. 260 × 184 mm. Pp 566 + xxviii. Illustrated. 1991. New York: Springer-Verlag. £70.50