To Mr. G. P. Baker of Harvard College and to Mr. C. S. Baldwin of Columbia College I am indebted for their kind ness in reading the proofs and in furnishing me with many excellent criticisms and suggestions. To Professor Barrett Wendell of Harvard College and to Mr. R. W. Herrick of the University of Chicago I am under special obligations, for to the instruction of the former is due much of what is good in the text, and to the constant counsel of the latter much of whatever may be found helpful in the exercises.