PREFATORY NOTE
Reading edition
The aims and the limits of the present work are sufficiently explained in the Introduction. Here it only remains for me to perform the pleasant duty of recording my gratitude to Mr. I. Abrahams, of Cambridge, for his friendly assistance in the revision of the proofs and my indebtedness to him for many valuable suggestions. He must not, however, be held to share all my views.
G. F. A.