books.google.co.in - In Purity and Danger Mary Douglas identifies the concern for purity as a key theme at the heart of every society. In lively and lucid prose she explains its relevance for every reader by revealing its wide-ranging impact on our attitudes to society, values, cosmology and knowledge. The book has been...http://books.google.co.in/books/about/Purity_and_Danger.html?id=MhdLLB4BNKEC&q=social+system&utm_source=gb-gplus-sharePurity and Danger
