Natural toxicants have been known from ancient times and man used them to gain various benefits by producing remedies, preserving goods or using them as a means for homicide. During the past century many new, toxicologically undefined industrial substanc es were introduced to the environment. It was an inevitable risk that substances dangerous to man, biota and environment, every man should contribute by being aware of his surroundings. In 'General Toxicology' the vastness of the toxicological scope is