 They developed a systematic way of ranking the effects of the various drugs, known as the Shulgin Rating Scale, with a vocabulary to describe the visual, auditory and physical sensations.He personally tested hundreds of drugs, mainly analogues of various phenethylamines (family containing MDMA, mescaline, and the 2C* family), and tryptamines (family containing DMT and psilocin).There are a seemingly infinite number of slight chemical variations, which can produce variations in effect — some pleasant and some unpleasant, depending on the person, substance, and situation — all of which are meticulously recorded in Shulgin's lab notebooks.