11.   Sheen developed processes that substitute organic chemicals such as quebrocho, an extract of a South American tree bark, for some of the inorganics.

12.   Taxol, the potent breast cancer drug, was discovered in yew tree bark.

13.   The treatment, such as it is, involves extracts of tree bark and plants -- and the use of shackles.

14.   Their penchant for snacking on tree bark can be devastating to the habitat.

15.   Their skirts were made from pulverized tree bark.

16.   They eat tree bark, and use the trees to build their dams.

17.   Traditional healers swear by a mixture of herbs and tree bark.

18.   Yohimbe, an herb whose active ingredients come from tree bark, causes blood engorgement of the pelvic region and does sometimes help impotence.

19.   Others have been surviving on leaves, tree bark and red chilies.

20.   People subsisted on very small grain rations, grass, leaves and tree bark, it said.