cataloged. In other words, hopes are 
pinned on manipulating a system in 
which only somewhat over half of the 
elements have been registered, much 
less understood. Imagine trying to 
build a computer or an airplane from 
such a starting point! 
■Another example of how little we 
know about tropical ecosystems con- 
cerns the basic coupling relationships 
known as mycorrhizae. These symbi- 
otic associations of fungi and the roots 
of trees are of essential importance 
in the recycling of minerals in tropical 
forests and hence in the stability and 
proper functioning of the forests them- 
selves. The coupling is so tight that 
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Understanding mycorrhizae is crucial 
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forests for other productive purposes; 
yet, how the relationships function has 
been demonstrated experimentally 
only within the past five years. Small 
wonder that our efforts to manipulate 
tropical forests for human advantage 
have so often met with total failure. 
Greater knowledge about the trop- 
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coveries that will promote human wel- 
fare. Approximately 45 percent of the 
medical prescriptions currently writ- 
ten in the United States, for instance, 
contain at least one product of natural 
origin, and as-yet-unknown plants 
might well contain chemicals that 
would assist in the cure for cancer. 
In addition, many of the important 
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