THOSE who spent three hours to see "Around the World in Eighty Days" will sympathize with anyone assigned twenty minutes to cover the next ten years in medicine. This paper is written with the complete realization of the sketchiness any such schedule demands, and is simply an attempt to include not all, but some, interesting issues.It has often been said that the best way to see ahead is to look behind, and if we do this we find in the field of medicine certain forces at work which will inevitably have continuing influence on the shape of things to . . .