DISCUSSION 451 
situation can be remedied artificially and, to the 
best of my knowledge, the artificial production 
of precipitation over a large area has never been 
conclusively demonstrated. However, the po- 
tentiality of particular techniques for producing 
focalized precipitation has been proven. 
Dr. Howell—In none of the experiments I re- 
ferred to, did we attempt to produce large-scale 
changes, or look for large-scale changes; and I 
believe that the points I was making were con- 
cerned entirely with small interruption of the 
drought in small-scale areas. 
