Kxpedition on the iniircli over the highland of ]?olivi:i. Tlie tfrniicraturc in this region, which is 

 between ton tliousand and twelve thousand feet high, varied one hundred degrees each twenty-four 

 liours 



In Tucuman, Argentina, the cows are driven from door to door, and milk is delivered fresh to cus- 

 tomers 



Because the slope of the mountains is gentle, it is possible to use carts between Sucre and Potosi, a 

 journey of four or five days 



160 



