Spent the day with Mr. Niven at Atcapazalco about half an hour out by tram, and a couple of miles from the tramway. It was real “wilds” with here and there an Indian village. Mr. Niven works indefatigably. All during the week his workmen prepare the ground for him and dig the trenches, and on Sundays he comes out himself, with a small pickaxe and goes over the ground. He has done this for twenty-seven years, and a great many things in the National Museum are of his discovery and presentation. There are three civilizations buried in layers, and because nothing is known of them, they are called the Aztec (three feet below the ground), the pre-Aztec and the primitives. The principal and most valuable of the layers is the middle one. Unfortunately, ours was not as productive a Sunday as it should have been, for Mr. Niven allowed a Mrs. Gould to turn Saturday into Sunday and she had all the benefit of the week’s digging, and unearthed a little Xochipili (The Goddess of Spring and Flowers). Nevertheless the soil yielded up innumerable little terra-cotta heads of Egyptian design, and incense burners, and obsidian knives. At the last, he came upon the wall of a building, it was an outer wall, and he had great hopes of what it might contain, but the hour was then late, and a thunder storm threatening and we had to abandon the pursuit. One learns patience at this job. TUESDAY, JULY 19, 1921. _Mexico City._ The National Museum is only open in the morning, but Mr. Niven and Professor (of Archaeology) Mena, opened it for me, and spent the afternoon explaining things to me. It is a place in which one might spend to advantage every day for two months. It contains a wealth of revelation. Even the countries that contain Mexican collections can have no idea of Mexican primitive culture. One _must_ see the collection in this Museum.