At the age of forty, Theodore Dreiser, author of at least three best sellers ("Sister Carrie," "Jennie Gerhardt," and "The Financier"), made his first trip abroad. The impact of the older continent on his direct, penetrating mind has resulted in a travel-book of an unusual sort, which Mr. Dreiser has entitled "A Traveler at Forty." In this book, with a frankness and utter disregard of Mrs. Grundy that is at times almost disconcerting, Theodore Dreiser expresses his interest in commonplace things and with keen naïveté challenges all the conventions and accepted ideas. It is certainly a travel-book out of the ordinary and goes far to establish the verdict of an English critic upon Mr. Dreiser "as the ablest living humanologist at work in the American field."