In this volume are collected general essays delivered by Dr. Horsley on various public or medical occasions and previously printed in various medical periodicals. Taken together, they reveal the trend of his medical and surgical philosophy. He would stimulate the curiosity and the spirit of inquiry that mark the clinician and investigator. He believes in surgery that conserves physiologic function. He has read widely, and the thoughts stimulated by his reading pour forth in these essays. To read them is to obtain the proof that not all surgeons are merely nimble fingered mechanicians of the human body.