ocr: We are - SO used to thinking of sight, closely followed by hearing, as the chief of the senses that we find it hard to visualise (the word itself is a giveaway) a worid which declares itself primarily to the sense of smells. Its not a world our mental processors can resolve or, at least, they are no longer practised in resolving it. Fora great many animals, however, smell - is the chief of the senses.