The real science in this little book includes the chemical makeup of the species for E. pachanoi, which is a good example to shows why you need a chemistry degree to understand it: Mescaline (over ...

They include Salvia divinorum, Trichocereus pachanoi (San Pedro cactus), Lophophora williamsi (peyote cactus), Sceletium tortuosum (”Bushman’s ecstasy”) and Catha edulis (khat).