Luke 9:3 Compared With Mark 6:8

Question: Will you kindly answer the following question?—In Luke 9 the Lord told the disciples not to take a staff when sending them out; whereas in Mark 6:8 He says, “Take nothing... save a staff only.” Can you say why the two Evangelists differ?
Answer: If the enquirer has access to vol. 9 (N.S.) of the Bible Treasury (1913) he will find on page 356 what, we think, may be a solution of his difficulty.