TO. DAY Professor Elliot Smith will talk about the way in which animals use senses other than sight to find their way about, for many animals, such as dogs, depend more upon smell than upon sight for recognizing people, places and food. Ho will discuss, too, the competition, at an early stage of evolution, between sight and smell as the chief means of guidance, which ended, of course, in the case of man in the triumph of vision as our chief means of knowing the world in which we live.