In Europe we calculate the number of inhabitants of a country by the extent of cultivation; in the Tropics, in the warmest and most humid parts of South America, very populated areas seem deserted because man cultivates but a small number of acres to feed himself. Without neighbors, virtually cut off from the rest of mankind, each family forms a different tribe. This isolated state retards the progress of civilization, which advances only as society becomes more populated and its connections more intimate and multiplied. But, on the other hand, solitude develops and strengthens liberty and independence; and has fed that pride of character which distinguishes the Castilian race.