The earnings per train-mile vary greatly; but for all the lines the average is 7s.
This may be taken to indicate the possible earnings of trained nurses working independently, as they usually do in America.
Such crude attempts as were made to prevent rates from being excessive concerned themselves with profits, and were designed to confiscate for the state treasury any earnings beyond a certain prescribed dividend.
The most scientific procedure, however, is to calculate the probable earnings of the immigrant during the rest of his lifetime, and deduct therefrom his expenses of living.
The remainder represents his net earnings which he will contribute to the well-being of the new country.