Four kinds of leaves and two kinds of agricultural residues (rice husk and straw) were rapidly pyrolyzed at 873-1173K in an inert atmosphere. Yields of gas, distillate and char produced from the samples were compared with those from sample sapwood. The gas from the leaves contains less carbon monoxide and more C2, C3 and C4 hydrocarbons, especially much more ethylene, than that from the sapwood. The gas from the agricultrual residues contains much hydrogen and less carbon monoxide than that from the sapwood.