Sentence:  But these innovating Medicaſters have introduced a Practice not only very precarious, but in many Reſpects extremely dangerous, and quite devoid of any one of the Qualities which conſtitute a good Remedy, "viz." to cure the Patient, as the <WSD>Axiom</WSD> has it, "cito, tuto, & jucunde, i.e." ſpeedily, ſafely, and pleaſantly. 
Meaning of the word marked with <WSD> tags:  An established principle in some artistic practice or science that is universally received.