Introduction,\ n~ inono acids are compounds related to ammonia as the ordiriar v oxygen acids are related to water.'It follows therefore that the familiar s~ ibstances guanidine, biguanide, cyanamide, dicyanodiamide and melamine as well as the less well known melam, melem, melon and hydrorileIonic acid, which many years ago were objects of intensive study.: are to be looked upon as ammono carhonic acids.
