Jan 28-1934 Monday, Tucson. Worked all day in the Hist. Sect. In the afternoon walked out to the north- ortheast portion of Tucson among the adobe houses of the Mexicans and Indians. The place once I finally saw the best caliche cut is near the place visited Jan 19. This cut on a street corner gives plainly having a green stone that the large vertical cuts are due to des- cending waters since here the soil is slightly reddish and it erats some of these tubs. I will go back to this place and put a sample pit since it is the best I have seen. I did get a piece on Jan 31 and the red clay soil in the large tubes shows clearly. I noticed also that Blake is correct in saying that the caliche is may always capped by a dense layer. It is here from 15 to 18 more thick. On that the reddish soils