Everything was ready by the end of the month.  Mr. H. L. Tucker, a member of Professor H. C. Parker’s 1910 Mr. McKinley Expedition and thoroughly familiar with the details of snow-and-ice-climbing, whom I had asked to be responsible for securing the proper equipment, was now entrusted with planning and directing the actual ascent of Coropuna.  Whatever success was achieved on the mountain was due primarily to Mr. Tucker’s skill and foresight.  We had no Swiss guides, and had originally intended to ask two other members of the Expedition to join us on the climb.  However, the exigencies of making a geological and topographical cross section along the 73d meridian through a practically unknown region, and across one of the highest passes in the Andes (17,633 ft.), had delayed the surveying party to such an extent as to make it impossible for them to reach Coropuna before the first of November.  On account of the approach of the cloudy season it did not seem wise to wait for their cooeperation.  Accordingly, I secured in Arequipa the services of Mr. Casimir Watkins, an English naturalist, and of Mr. F. Hinckley, of the Harvard Observatory.  It was proposed that Mr. Hinckley, who had twice ascended El Misti (19,120 ft.), should accompany us to the top, while Mr. Watkins, who had only recently recovered from a severe illness, should take charge of the Base Camp.

The prefect of Arequipa obligingly offered us a military escort in the person of Corporal Gamarra, a full-blooded Indian of rather more than average height and considerably more than average courage, who knew the country.  As a member of the mounted gendarmerie, Gamarra had been stationed at the provincial capital of Cotahuasi a few months previously.  One day a mob of drunken, riotous revolutionists stormed the government buildings while he was on sentry duty.  Gamarra stood his ground and, when they attempted to force their way past him, shot the leader of the crowd.  The mob scattered.  A grateful prefect made him a corporal and, realizing that his life was no longer safe in that particular vicinity, transferred him to Arequipa.  Like nearly all of his race, however, he fell an easy prey to alcohol.  There is no doubt that the chief of the mounted police in Arequipa, when ordered by the prefect to furnish us an escort for our journey across the desert, was glad enough to assign Gamarra to us.  His courage could not be called in question even though his habits might lead him to become troublesome.  It happened that Gamarra did not know we were planning to go to Cotahuasi.  Had he known this, and also had he suspected the trials that were before him on Mt.  Coropuna, he probably would have begged off—­but I am anticipating.