In 1825 Michael Faraday isolated a sweet-smelling chemical that he dubbed bi-carburet of hydrogen. That molecule, better known as benzene, is perhaps the most famous molecular ring in chemistry.

THE appearance of a new edition of this well-known book will be welcome to all analytical and other chemists. Three reagents, dihydroxy-tartaric acid osazone for calcium, phenylthiohydantoic acid ...