This definitive and most detail work ever to have been published, devoted exclusively to the chemistry and biology of chlorinated insecticides, comes from the authoritative pen of a leading investigator in this field. It should serve for many years to come as the prime reference source both for instructional and research purposes, for it not only delineates that which is known about this valuable class of compounds, but also emphasises those important biological and ecological areas in which our knowledge is still much too sketchy and in which further investigation may be expected to uncover facts of great interest and wide applicability.