By Varro E. Tyler. 6"x 8.5", 209 pg, paperback. Varro Tyler states not only what works and why an herb works, but how it works best. Amidst the myriad of herb books, the author has produced a practical volume of reliable information for all health care practitioners. This book advocates a Western scientific approach to the subject for the professionals, yet the book is easy enough to read and understand for the layperson.