This collection of papers on aspects of statistics in toxicology is will be of interest to all medical statisticians. Toxicology is indeed an area which presents challenging statistical problems. The authors are internationally known and respected and include A. Whitehead and R. N. Connor (University of Reading) L. Ryan (Harvard) A. P. Grieve (Pfizer Research) This is the latest in the popular Royal Statistical Society Lecture Series, and will be essential reading for all those involved in this area.