39. THE DAWN OF A NEW RELIGIOUS ERA and other Essays, by Paul Carus. 1899. 15c, mailed 18c. (9d.). Pp. 50.
40. KANT & SPENCER, a study of the Fallacies of Agnosticism, by Paul Carus. Second edition. 1904. 20c, mailed 25c. (1s.). Pp. 104.
41. THE SOUL OF MAN, an Investigation of the Facts of Physiological and Experimental Psychology, by Paul Carus, with 182 illustrations and diagrams. Third edition. 1905. 75c, mailed 85c. (3s. 6d.). Pp. xviii., 482.
42. WORLD’S CONGRESS ADDRESSES, Delivered by the President, the Hon. Charles Carroll Bonney, LL. D., to the World’s Parliament of Religions and the Religious Denominational Congresses of 1893, with the closing address at the final session of the World’s Congress Auxiliary. Printed as a Memorial of the Scientific Events of the Columbian Year. 1900. 15c, mailed, 20c. (9d.). Pp. iv., 88.
43. THE GOSPEL ACCORDING TO DARWIN, by Woods Hutchinson, A. M., M. D. 1900. 50c, mailed 57c. (2s. 6d.). Pp. viii., 241.
44. WHENCE AND WHITHER, an Inquiry into the Nature of the Soul, Its Origin and Its Destiny, by Paul Carus. Second edition. 1903. 25c, mailed 32c. (1s. 6d.). Pp. viii., 218.
45. AN ENQUIRY CONCERNING HUMAN UNDERSTANDING, by David Hume. Reprinted from the edition of 1777. With Hume’s Autobiography and a letter from Adam Smith. Fourth thousand. 1904. 25c, mailed 31c. (1s. 6d.). Pp. xxv., 180.
46. AN ENQUIRY CONCERNING THE PRINCIPLES OF MORALS, by David Hume. Reprinted from the edition of 1777. 1900. 25c, mailed 31c. (1s. 6d.). Pp. 169.
47. THE PSYCHOLOGY OF REASONING, Based on Experimental Researches in Hypnotism, by Alfred Binet. Doctor of Science, Laureate of the Institute, (Académie des Sciences and Académie des Sciences Morales), Director of the Laboratory of Physiological Psychology in the Sorbonne (Hautes Études). Translated from the second French edition by Adam Gowans Whyte, B. Sc. 1901. 25c, mailed 31c. (1s. 6d.). Pp. 191.