With the ultimate aim of studying the relationships between structure and antibacterial action, we have prepared a series of N4-acyl-sulfanilyland sulfanilyl derivatives of 2-, 3-and 4-aminopyridine, 2-, 3-and 4-(pyridy1)-methylamine, and [l-(2-, 3-and 4-pyridyl)-ethyl]- amine. More particularly, we have wished to study the effects of position isomerism, introduction of a methylene group between the heterocyclic ring and amino nitrogen, and ...