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this important field he had for many years the able assistance of Mr. DeLancy W. Gill who is still, in 1927, the leading illustrator of the Smithsonian and its departments. A related work was the preparation of the exhibits of the Institution for the numerous expositions, American and foreign. 
  In April 1884 the monotony of home-staying was broken by a trip to Mexico on which Holmes was the guest of Mr. and Mrs. Chain, professional photographers who had the use of a special car provided with a studio and comfortable living accommodations. Mr. W. H. Jackson, photographer, joined the party at El Paso, Texas. It was a delightful excursion of two months with visits to Mexico City, Puebla, Zacetecas, Chihuahua, Oaxaco, Cholula and other places of note giving the opportunity of studying peoples, museums, ancient ruins and a number of the great volcanic mountains.
  Early in August 1886 he had the good fortune to be asked to join a field party of scientists planning a three months study ^[[large part]] of the Indian tribes and ancient ruins in New Mexico and Arizona. In the party were Professor S. P. Langley, Secretary of the Smithsonian Institution, Major J. W. Powell, Director of the Geological Survey, James Stevenson, Assistant to Dr. Hayden, and Mrs. Stevenson, and others interested in the Pueblo region. A permanent camp was established in the San Diego valley, a tributary of the Rio Grande, fifty miles West of Santa Fe, with the Jemez mountains rising on the west.
  Holmes' own energies were devoted mainly to an examina-