On this continent at least, Hoffer and Osmond pioneered in hallucinogens. In the less restrictive atmosphere of Saskatoon (Canada) Hoffer is still a very prolific worker with them, while Osmond, at Princeton, is suffeling from our restrictions. In this book they have issued what I assume is their definitive statement on hallucinogens. Hoffer and Osmond did much to open the field and stimulate others to work in it, but in their own writings they have unfortunately also done much to confuse.