The illustrations marked † are from a series of valuable photographs, also taken at Uxmal, by Captain Herbert Dowding, Royal Navy, who placed at my disposal such of them as I considered to be required for the purposes of this work.

I wish to call particular attention to the representation of that part of the Casa de las Monjas where the adjacent Temple of the Dwarf is seen. In comparing the structures with the pyramid, it has to be remembered that the Casa de las Monjas is placed upon a raised platform not less than seventeen feet in height. The Pyramid of the Dwarf is completely detached.

Upon an examination of the frontispiece it will be noticed that the centre stone which, when I saw it lying on the ground at Palenque, was uninjured, is there shown in two portions which are kept in position by iron clamps.

It was accidentally broken when being removed from Palenque to the museum in the City of Mexico.

The left slab, upon which is graven the smaller figure, is from a photograph of a moulding made by M. DesirÉ Charnay. The right slab is from a photograph of the original stone now placed in the museum at Washington, and which was represented in the Memoir upon the Palenque Tablet written by Professor Rau, and published by the Smithsonian Institution. The photographs of the right and left slabs have been reduced to the size of that of the centre, and thus an exact reproduction of the whole of the Tablet of the Cross has been obtained. The representation in the frontispiece is, approximately, upon the scale of one inch to the foot and is therefore a twelfth of the size of the original tablet when it was in its position within the temple.

The illustrations of Indians are from photographs collected by me during my travels and were selected as being typical of the respective tribes. My small sketch of the entrance to the Casa de las Monjas at Uxmal is drawn to scale, and the character of the Indian horizontal arch is delineated in its architectural proportions.