48. A TREATISE CONCERNING THE PRINCIPLES OF HUMAN KNOWLEDGE, by George Berkeley. Reprint edition. 1904. 25c, mailed 31c. (1s. 6d.). Pp. xv., 128.
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56. ANTS AND SOME OTHER INSECTS, an Inquiry into the Psychic Powers of these Animals, with an Appendix on the Peculiarities of Their Olfactory Sense, by Dr. August Forel, late Professor of Psychiatry at the University of Zurich. Translated from the German by Prof. William Morton Wheeler, American Museum of Natural History, New York. 1904. 50c, mailed 53c. (2s. 6d.). Pp. 49.