Book I: The Story Continues This is the continuation of the love story from PIHKAL: A Chemical Love Story with a blend of travel, botanical facts, scientific speculation, psychological and political commentary. Book II: The Chemistry Continues Describes in detail a wealth of tryptamines in the same format as Book II of PIHKAL, plus appendices presenting topics such as cactus alkaloids, natural beta-carbolines, current drug law, and all known tryptamines (from the literature) that might be psychedelic. | TIHKAL by Alexander Shulgin, Paperback | Indigo Chapters