We have had some good illusuations of different approaches to the study of forest insects. The subject has by no means been exhausted-the physiological approach, for instance, has been barely touched on—but I think the point has been brought out that there is no essential difference between the problems and methods of forest entomology and, say, agricultural entomology. There may be some differences in emphasis–the nature of the forest crop encourages the long-term ecological approach–but even this difference seems to be disappearing, as may he illustrated by Dr. Glen's recent paper on factors governing the abundance of insects.