174 TANKS AND WELLS OF NEW SOUTH WALES, 
distributed that the minimum of running water is formed, when, 
consequently, there is no concentration of rainfall off large areas 
reduce the evaporation surface, and to further lessen loss by 
where light recurrent rains fall on a baked and heated ground 
surface, and are exposed to hot and thirsty winds, the evaporation 
must be enormous, I yet think we are justified in taking more 
dry countries, that we should at once despair? I think not. ie 
: rie : 
‘estimates the evaporation at about 7 ft, Presumab! the evapo- : | 
vation off the soil, as compared with that off water, will bea ee 
