Don Luis rang and a servant appeared.
"Have one of my cars ordered," commanded Don Luis.
Ten minutes later a car rolled around to the entrance.
"You will come with us, Carlos?" inquired Don Luis.
"Assuredly, Don Luis," replied the secretary, in the tone of a man who was saying that he would not for worlds miss an expected treat.
It was a seven-passenger car of late design. Into the tonneau stepped the two Mexicans and the two young engineers.
"To the mines," ordered Don Luis.
"Do you wish speed, excellency?" inquired the chauffeur.
"No; we will go slowly. We may wish to talk."
Gravely, in military fashion, the chauffeur saluted, then allowed the automobile to roll slowly away.