While trying to give our daily experiences and actual camp life in a readable way, I have adhered to accuracy of statement.

I believe that any one who wishes to do so can use this book as a guide for navigating the river as far as Kanab Canyon.

I have not relied on memory but have kept for continual reference at my elbow not only my own careful diary of the journey, but also the manuscript diary of Professor Thompson, and a typewritten copy of the diary of John F.
Steward as far as the day of his departure from our camp.

I have also consulted letters that I wrote home at the time and to the Buffalo _Express_, and a detailed draft of events up to the autumn of 1871 which I prepared in 1877 when all was still vividly fresh in mind.

In addition, I possess a great many letters which Professor Thompson wrote me up to within a few weeks of his death (July, 1906), often in reply to questions I raised on various points that were not clear to me.