PREFACE TO FOURTH EDITION 
It is a satisfaction, after six years of exposure to 
criticism, not to feel constrained to unsay anything 
that was said in the first edition of these pages. 
Alterations from previous edition of greater or less 
importance are to be found on pages 3, 4, 16, 17, 19, 27, 
28, 29, 31, 33, 36, 40, 45, 113, 128, 129, 132, and 161. 
Boston, January, igi6. C. B. F.