Tihkal The Continuation Author:Alexander Shulgin TiHKAL is a 1997 book written by Alexander Shulgin and Ann Shulgin about a family of psychoactive drugs known as tryptamines. A sequel to PiHKAL, the full title of the book is Tryptamines I Have Known And Loved: The Continuation. — TiHKAL, much like its predecessor PiHKAL, is divided into two parts. The first part is a fictionalized autobiography... more », continuing where PiHKAL left off, but it then continues into a collection of essays. These essays range from psychotherapy and the Jungian mind to the prevalence of DMT in nature, ayahuasca and the War on Drugs. The second part of TiHKAL is a detailed synthesis manual for 55 psychedelic compounds (many discovered by Alexander Shulgin), with dosages, chemical structure and qualitative comments.« less