Keith Simpson

The Skeleton in Forensic Medicine

contended that ultra-violet irradiation, which kills micro-organisms in droplet nuclei though not in dust particles, can hinder the aerial spread of infection, whether used as a barrier or for the whole upper atmosphere of a room. The circumstances of measles epidemics, several in the U.S.A. and one in London, are analysed: the attack rate was greatly reduced in irradiated class rooms at one of the schools, and in those where the process failed reasons are given for believing that transmission was occurring mainly elsewhere-at one school in buses. It is emphasized that dust-borne infection is a totally different problem, calling for different measures. It is also admitted regretfully that sanitary engineering, so far as it concerns the provision of pathogen-free air, is in its infancy; most of those who have to design and test installations still have almost everything to learn. The facts and arguments in this book demand the closest consideration by anyone concerned with air hygiene. As an epitome of the work initiated by a great pioneer in this subject it may well attain the rank of a classic. L. P. GARROD.