white, fails to do, whether for good or evil, usually gives you a truer knowledge of the man than the things he succeeds in doing. When you fully realise this acuteness on one hand and this mechanical incapacity on the other which exist in the people you are studying, you can go ahead. Only, I beseech you, go ahead carefully. When you have found the easy key that opens the reason underlying a series of facts, as for example, these: a Benga spits on your hand as a greeting; you see a man who has been marching regardless through the broiling sun all the forenoon, with a heavy load, on entering a village and having put down his load, elaborately steal round in the shelter of the houses, instead of crossing the street; you come across a tribe that cuts its dead up into small pieces and scatters them broadcast, and another tribe that thinks a white man's eye-ball is a most desirable thing to be possessed of—do not, when you have found this key, drop your collecting work, and go home with a shriek of "I know all about Fetish," because you don't, for the key to the above facts will not open the reason why it is regarded advisable to kill a person who is making Ikung; or why you should avoid at night a cotton tree that has red earth at its roots; or why combings of hair and paring of nails should be taken care of; or why a speck of blood that may fall from your flesh should be cut out of wood—if it has fallen on that—and destroyed, and if it has fallen on the ground stamped and rubbed into the soil with great care. This set requires another key entirely.
I must warn you also that your own mind requires protection when you send it stalking the savage idea through the tangled forests, the dark caves, the swamps and the fogs of the Ethiopian intellect. The best protection lies in recognising the untrustworthiness of human evidence regarding the unseen, and also the seen, when it is viewed by a person who has in his mind an explanation of the phenomenon before it occurs. For example, take a person who, believing in ghosts, sees a white figure in a churchyard, bolts home, has fits, and on revival states he has seen a ghost, and gives details. He has seen a ghost and therefore he is telling the truth. Another person who does not believe in ghosts sees the thing, flies at it and finds its component parts are boy and bed-sheet.
