In collecting the material for a book of this kind, involving not only untold centuries of warfare but, in addition, a discussion of prehistoric populations of the Philippines, the sources have been so varied as almost to prevent acknowledgement.

Much of the material was collected from the natives during the seven years I spent in Mindanao. During that period I made the acquaintance of elders of many Moro barrios, all of whom delighted in telling tales of the old days when the kri was the measure of a man.

For the verification of dates and campaigns I have depended upon standard histories of the Philippines. Among the books consulted were:

I am particularly grateful to John Hackett, editor of the Mindanao Herald, for the material on "Kris versus Krag." Many of the details of this period were obtained from the files of his paper.

I am also indebted to many priests of the Jesuit Order who kindly placed at my disposal sources of information not usually accessible.

The preparation of this book entailed a tremendous amount of reading, as the material has not, I believe, been before confined to a single volume. There are, perhaps, glaring omissions; there are probably some errors, although no effort has been spared to keep the text accurate.

I make no claim for originality, as the story of the Moros is mostly history. I have supplemented my personal research by drawing freely upon all available sources in an effort to encompass within the covers of one book everything about the Moros that anyone might care to know.

G. V. H.