8. Note -- Read above suggestions every few days, de- voting half an hour or so to thoughtful consideration of the objects of our field work, which are: To as- certain everything possible in regard to the natural history of the vertebrate life of the regions traversed, and to make careful record of the facts gathered in the form of specimens and notes, to be preserved for all time. All this is for the information of others; strive to make your records in all respects clearly intelligible. Remember that the value of our manuscripts increases as the years go by and faunal changes take place. Some of our earlier notebooks describe conditions now vanished in the localities they dealt with. J. Grinnell September 12, 1933.