though they be supplemented by microphones and microscopes, we always strive to see and hear a little more than the best of instruments allows. If, after all, the biological vitalists are right, so long as we are interested in the constitution of matter there is a motive for further variation. But, as Professor Low points out, our æsthetic susceptibilities will have to be modified on the way. When we first begin to perceive the fauna in the cheese and the microbes on our walls, and when, like the birds, we go into the country to listen to the worms, we shall have to revise our values. Our poets, too, will find new themes to sing.
Memory, even more than sense, suggests many possibilities of development. By hypnotism, or by the natural working of the unconscious mind, it is said that we can recall even the earliest events of life. Soon, perhaps, this power will be under conscious control, and the autobiographers will have their millennium too. But, quite apart from this, new methods of education and a little Scientific Management would enable us, even now, to do much more with our memories through the powers we already possess.
The developments of intellectual life are the most difficult to foresee. But there are a few clues which enable us to guess at their possible nature. What purely intellectual achievements have been made in the past seem to depend upon the development of language and the elaboration of symbolism convenient to thought. Philosophers and scientists have continually expressed dissatisfaction at the modes of expression at their disposal in a language primarily devised to express our emotional and practical demands. Scientists have invented a technical terminology in their nouns. Mathematicians go somewhat further, and have invented more thorough-going systems of symbolism. Philosophers have always found it necessary to invent peculiar manners of speech, and now are seriously beginning to follow the mathematicians. It is possible that quite a new language will arise, probably a variety of purely technical languages—useful for different purposes of thought. The process of