his own benefit. A very obvious example is the replacement in some Middle East arid 

 districts of the migrant gazelle, which only nibbles thorn- bushes, by the goat, which 

 eats them to the ground. 



If semi-deserts are to become free ranching grounds the greatest care will have 

 to be taken as to stocking well below capacity, moving the cattle constantly, and use- 

 ing the principles of pasture management. 



In the meantime the scientist, and particularly the biologist, must find out a great 

 deal more about desert ecology and the correlation betv/een the water resources and 

 the indigenous flora. 



