Insects are in many ways the most wonderful section of the animal world, and some theorists have predicted that they will ultimately succeed mankind. At any rate. some of them do quite a lot to hasten the consummation by spreading disease amongst humanity. Flies go from the dustbin to the larder, and from decaying meat to the milk-pan in the dairy, and on those marvellously-fashioned feet of theirs they carry the seeds of disease. This is the important subject that Dr. Parsons will develop tonight.