…the contents of a manuscript found in 1879 in a tree on the Middle Fork of the Feather River, the first persons of Caucasian blood to penetrate the Butte County area were two soldiers who had wandered from the army of Cortez while the latter was in Mexico, in 1519. The story of the finding of this manuscript is a most interesting one. In the month of April, in the year 1879, a tree was cut down by two miners on the Middle Fork of the Feather. The outside appearance of the tree indicated that it was solid throughout. The tree however, proved to be hollow inside, and in this hollow a roll of manuscript was found, written in Spanish and wrapped in such a manner that the writing was preserved. The hole in the tree had grown over with the lapse of years. The manuscript purported to give an account of two men who had strayed from the army of Cortez and who had made their way north as far as the place where the manuscript was deposited. The date of the deposit was not given, the two soldiers apparently having lost track of time. The manuscript was written in old Spanish, and was finally sent to Madrid for interpretation.
Mansfield, G.C. 1918. History of Butte County, California, p.36. Historic Record Company, Los Angeles CA.