The earliest of the modern explorers were Luis Martin, a Mexican architect, and Colonel de la Laguna, who examined the ruins in 1802; and it was from Martin and his drawings that Humboldt drew the information with which, in 1810, he first engaged the attention of the general public upon Mitla, in his _Vues des Cordillères_. Dupaix’s visit was in 1806. The architect Eduard L. Mühlenpfordt, in his _Versuch einer getreuen Schilderung der Republik Mejico_ (Hannover, 1844, in 2 vols.), says that he made plans and drawings in 1830,[1028] which, passing into the hands of Juan B. Carriedo, were used by him to illustrate a paper, “Los palacios antiguos de Mitla,” in the _Ilustracion Mexicana_ (vol. ii.), in which he set forth the condition of the ruins in 1852. Meanwhile, in 1837, some drawings had been made, which were twenty years later reproduced in the ninth volume of the _Smithsonian Contributions to Knowledge_, as Brantz Mayer’s _Observations on Mexican history and archæology, with a special notice of Zapotec, remains as delineated in Mr. J. G. Sawkins’s drawings of Mitla, etc._ (Washington, 1857). Bancroft points out (iv. 406) that the inaccuracies and impossibilities of Sawkins’ drawings are such as to lead to the conclusion that he pretended to explorations which he never made, and probably drafted his views from some indefinite information; and that Mayer was deceived, having no more precise statements than Humboldt’s by which to test the drawings. Matthieu Fossey visited the ruins in 1838; but his account in his _Le Méxique_ (Paris, 1857) is found by Bancroft to be mainly a borrowed one. G. F. von Tempsky’s _Mitla, a narrative of incidents and personal adventure on a journey in Mexico, Guatemala and Salvador, 1853-1855, edited by J. S. Bell_ (London, 1858), deceives us by the title into supposing that considerable attention is given in the book to Mitla, but we find him spending but a part of a day there in February, 1854 (p. 250). The book is not prized; Bandelier calls it of small scientific value, and Bancroft says his plates must have been made up from other sources than his own observations.[1029] Charnay, here, as well as elsewhere, made for us some important photographs in 1859.[1030] This kind of illustration received new accessions of value when Emilio Herbrüger issued a series of thirty-four fine plates as _Album de Vistas fotográficas de las Antiguas Ruinas de los palacios de Mitla_ (Oaxaca, 1874). In 1864, J. W. von Müller, in his _Reisen in den Vereinigten Staaten, Canada und Mexico_ (Leipzig, in 3 vols.), included an account of a visit.[1031] The most careful examination made since Bancroft summarized existing knowledge is that of Bandelier in his _Archæological Tour in Mexico in 1881_ (Boston, 1885), published as no. ii. of the American series of the _Papers of the Archæological Institute of America_, which is illustrated with heliotypes and sketch plans of the ruins and architectural details in all their geometrical symmetry.