190 C Calkins, Mary Whiton, 1863-1930, The persistent problems of philosophy, an introduction to metaphyslcs through the study of modern systems, by Mary ByatomaWhiton Calkins,.. 4 th rey. ed., containing a naw chapter on - twentieth century philoaophy. New York, The Macmillan company, 1919. xxvi, 601 p. 20 cm. Contains bibliographies