Mexico City Monday Sep. 17 - 1906 Had my return ticket adjusted and secured a round trip ticket from San Luis Potosi to Tampico (13-17 Mex). Packed by my box and had Minjima ship it via Vera Cruz and Hard Line. This addressed "Yale University, Geological department, New Haven, Conn., United States, via Vera Cruz and Hard Line. [Minjima & berton]." Later he will send me the freight receipt. Bills of my accounts at the Carmen and packed up. Paid my hotel room next 10 days @ $5 and 7 days @ $3.00 = $71 Mexican. (Mexico City Tuesday Sep. 18.) Left at 9.45 A.M. for Zorcalas. In a rail road cut and tunnel near Bar- cientos one sees how the walls are made. Here the adobe is laid down from a distinction of the hill very flatening out. The bed rock in the tunnel is a tufa. adobe tufa adobe The same also next of Elendo