E-text prepared by the Online Distributed Proofreading Team (http://www.pgdp.net) from page images generously made available by Internet Archive (https://archive.org) Note: Images of the original pages are available through Internet Archive. See https://archive.org/details/onsameness00fulluoft Transcriber's note: Text enclosed by underscores is in italics (_italics_). Small capitals have been transcribed as ALL CAPITALS. The Table of Contents can be found after the main text. A list of other corrections can be found at the end of the document. ON SAMENESS AND IDENTITY. * * * * * * PHILOSOPHICAL SERIES. NUMBERS IN PREPARATION. NO. II. STUDIES FROM THE LABORATORY OF EXPERIMENTAL PSYCHOLOGY. Researches are in progress on: Memory and the Least Noticeable Difference in Sensation; Measurement in the Diagnosis of Diseases of the Nervous System; The Rate at which the Nervous Impulse Travels; The Personal Difference in the Time of Mental Processes; The Rate, Extent, and Force of Movement; Accuracy of Perception as a Function of the Time of Stimulation; The Correlation of Mental Time, Intensity, and Extensity; The Relative Value to Science of Experiment, Observation, and Memory; The Building of Complex Perceptions; etc. NO. III. DESCARTES' "MEDITATIONS," with Latin and English Texts, and Philosophical Analysis. By George Stuart Fullerton and William Romaine Newbold. * * * * * * Publications of the University of Pennsylvania PHILOSOPHICAL SERIES. Edited by George Stuart Fullerton Professor of Philosophy and James McKeen Cattell Professor of Psychology. No. 1. April, 1890. ON SAMENESS AND IDENTITY. A Psychological Study: Being a Contribution to the Foundations of a Theory of Knowledge. by GEORGE STUART FULLERTON. Philadelphia University of Pennsylvania Press Publishers On Sameness and Identity. PART I. THE KINDS OF SAMENESS. And some require everything accurately stated; whereas, this accuracy annoys others, either because of their inability to follow a train of reasoning through, or because of its hair-splitting character; for accuracy does involve some hair-splitting. Aristotle, Metaph. Book I, The Less, c. 3.