M.G. van der Werf, author of the doctoral thesis Crop physiology of fibre hemp (1994), and Dr. Ivan Bocsa criticized Herer for making unrealistic claims regarding the potential of hemp (cf. the work of Lyster Hoxie Dewey). Herer claimed that hemp produces higher yields than other crops. Van der Werf argued that is simply wrong. Under most favorable growing conditions, other crops such as maize, sugar beet, or potato produced similar dry matter yields. Fiber hemp is in no way exceptional in terms of weight yield. Herer claimed that hemp hurds, which make up 60 to 80% of the stem dry weight, contain 77% cellulose. Van der Werf argued that is wrong. Cellulose content of hemp hurds has been found to vary between 32 and 38% (Bedetti and Ciaralli 1976, van der Werf 1994). Possibly, Herer confused the hurds, which form the woody core of the hemp stem, with the bark, which forms the outer layer of the hemp stem. The bark contains the long bast fibers which are used in textile manufacturing. Legacy A sativa-dominant hybrid strain of cannabis was named after Herer in honor of his work. The Jack Herer strain was originally created by Sensi Seeds. Today almost all seed banks carry their own take on this famous cannabis favorite. This strain has won several awards, including the 7th High Times Cannabis Cup. Jack Herer was also inducted into the Counterculture Hall of Fame at the 16th Cannabis Cup in recognition of his first book. The Jack Herer Cup, created by R. Foreman is held in Amsterdam, Colombia, Las Vegas, Jamaica, Germany, Oklahoma City, Michigan and Thailand each year to honor the Worldwide Cannabis Legalization Movement that Jack Herer helped start. The godfather of the cannabis movement's legacy is carried on today by his son Dan Herer. Emperor of Hemp is a documentary made about Herer's life that aired on PBS stations throughout the U.S., and was translated into French and Spanish. Works Books (with Al Emmanuel) G.R.A.S.S.: Great Revolutionary American Standard System: The Official Guide for Assessing the Quality of Marijuana on the 1 to 10 Scale (Primo Publications, 1973) The Emperor Wears No Clothes (Van Nuys, California: Ah Ha Publishing, 1985, 1990) Articles "Cannabis Medicines Banned," Totse.com, archived at the Wayback Machine — excerpt from The Emperor Wears No Clothes "Hemp for Victory — Coverup," Totse.com, archived at the Wayback Machine See also List of