ABSTRACT
In this book only the more elementary and fundamental facts and laws of mental life have been presented. A complete account of the science of psychology would require many volumes. We have studied only the more general facts of ordinary human mental life, but psychology deals also with the details of sensations, the associations of ideas and the like, with the facts of abnormal and diseased minds and with the mental processes of animals. I have, as a rule, described only those facts which may be appreciated by simple observations and reflection, but psychology uses also intricate analysis, elaborate experiments, exact measurements and wide comparisons. The subject matter of psychology covers a wide range of facts, and these are studied by many different methods.
