ADAPTATION OF PLANTS AND ANIMALS 341 
other fields which need intensive laboratory studies conducted 
over a long period of time. These obviously are too big a task for 
individual countries. 
Information about arid land problems is not always available 
to most of the interested people. The dissemination of this type 
of information is another field that needs more international co- 
operation. 
Successful introduction of grasses and legumes into different 
countries, although quite recent, has been in many cases out- 
standing. The establishment of an international unit to help 
procurement and proper distribution of plant material might facil- 
itate exchange of seeds and information from different arid lands 
in the world. 
Meetings, such as the international arid lands meetings, pro- 
vide a very worth-while means for exchange of ideas among 
world experts. More of this type should be planned in different 
parts of the world and at regular intervals. 
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