The importance of language for the real understanding of culture is being more and more felt by most students of civilisation. A linguistic system is an expression, though not a complete one, of the system of perception which a social group has of its surroundings and of itself. No civilisation can be fully understood by one who ignores its linguistic means of expression. Modern anthropologists cannot work any more through interpreters if they want to collect really reliable material. As Edward Sapir writes, ‘Some day the attempt to master a primitive culture without the help of the language of its society will seem as amateurish as the labors of a historian who cannot handle the original documents of the civilization which he is describing.’