The first man Of science who ever saw the original cartoons Of the Plates which carry the argument Of my Work, is the man Of science who offered, Of his own motion, to read and revise my proofs. There are some students who have written books, and some students who have not written books, who will understand what this gentleman has done for me after they have glanced through the volume; although he does not stand committed in any way to my views by this action. There must be something in the genial and kindly nature of this man of science which makes him a victim Of the Preface. I have Observed that an enormous number Of scientific works contain acknowledgments to Professor Reginald Stuart Poole. He shall not escape my Preface; there are none which owe him more. I have had from him the assistance Of an Egyptologist and hieroglyphic scholar, of an Orientalist, and Of a historian trained by the study Of coins — the only study which suggests a knowledge Of all art and of all history. Finally, I owe to my American friends the gratitude which goes out to every warm heart and every helping hand. Among these are my own brother and a lady who shall be nameless.