Excerpt from The Theory of Light
In undertaking the preparation of this fourth edition I felt, both on account of my respect for its late author and because the book has been so successful, that I ought to leave untouched, as far as possible, the main body of the text. Accordingly in this respect changes have only been made where such were necessary, in order to correct the few errors or inaccuracies which I have noticed, or to which I have seen attention directed occasionally in scientific papers. I have not considered it necessary to mark these alterations in any special way, but I gladly acknowledge here the assistance which such references have given me.
The developments that have taken place since the publication of the third edition have rendered necessary a fuller treatment of dispersion, an account of radiation phenomena in a magnetic field, and a more complete presentation of the electromagnetic theory. The additions that I have made to the text in these respects and those referring to recent experimental work cover some thirty pages, and these I have enclosed in { } brackets. In view of the size of the book, I could only aim in these additions at giving an introductory account of the theories and work to which they refer. I hope, however, that they will materially increase the usefulness of the book, and, while encouraging the student to consult original sources, enable him to do so with advantage. I have endeavoured to give full references to the sources on which I have drawn.
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