Sometimes it lingers below the surface. But when you smile at them. they smile back. Our growing army of tourists and visitors remains our best asset in our bid for interAmerican friendship and hemispheric solidarity. More than 650 visas of American citizens are cleared every day in the coniulate at Mexico City. and when the 30yearold dream of a usable. 3.400mile highway from the Texas border to the Panama Canal becomes a reality. the number will jump significantly. The impact of such a wave of tourists must necessarily be great. It can do much good or it can do harm.