It is scarce necessary for me to make special acknowledgement to Senor Medina in all that relates to the American tribunals, for this is sufficiently attested by the constant reference to his works. With regard to Mexico I am under particular obligation to David Fergusson Esq. For the use of collections made by him during long residence in that Republic and also, to the late General Don Vicente Riva Palacio for the communication of a number of interesting documents. To the late Doctor Paz Soldan of Lima my thanks are also due for copies made in the archives of Peru prior to their dispersion in 1881.