I have still to express my obligations to generous friends: first, and especially, to Professor J. S. Mackenzie of Cardiff both for his long and careful criticisms and for the arduous work which he kindly undertook of reading through all the proofs; again to Professor G. F. Stout of St Andrews for many valuable and astute comments; and finally to my colleague, Professor W. R. Sorley, not only for his literary help but for his continuous encouragement throughout my labours.
JAMES WARD.
- Trinity College, Cambridge.
- September, 1911.
P. S. A second edition of this book being called
for within a year, it has only been possible for me to
correct sundry misprints, which various friends have
kindly pointed out, and to add at the end of the
volume some Replies to Criticisms.
J. W.
- July, 1912.
