Introductory remarks
We hope that in this joint meeting the special knowledge of each contributor will help towards solution of the questions: what is man? where, when and why did he begin? The organization of the meeting jointly by the British Academy and the Royal Society draws attention both to the nature of man and to the difficulties that he meets in describing himself. The characteristics by which human life is maintained are governed in man perhaps more than in any other creature by a double dependence - on capacities acquired by inheritance and on those learned later in life. Moreover, investigations of these two aspects requires different backgrounds and techniques, which we could perhaps characterize as scientific for the study of inherited features and humanistic for the study of learning and culture. To put it differently, study of somatic inheritance requires a knowledge of science while extrasomatic inheritance is concerned with human languages, history and civilizations. The evolution of man has been very rapid over the last 2 Ma and, at least in the later part of this time, extrasomatic transmission of information has been a major feature of the changes. Since the invention of language, individuals have been able rapidly to acquire detailed information from many others instead of only from two parents. Man evolves fast because of this multiparental inheritance of information about how to survive. Yet the two methods of transmission are not wholly separate. The capacity to pass information by speech or writing must depend upon very specific characteristics that are inherited through DNA. Certain features of the brain and mouth are needed for speech, and still more complex properties to allow understanding of even the simplest logical propositions. Again, the social system that is necessary for learning and transmission of culture depends upon properties of the brain and endocrine system that reduce aggression, impose restraint and allow cooperation. Five hundred apes would not sit quietly and listen to another ape like the audience at this meeting.