This seminal work by Lipman Bers is a must-read for anyone interested in the fascinating and complex field of complex analysis and geometry. Focusing on the theory of holomorphic differentials and their relationship to moduli spaces, Bers provides a rich and detailed exposition of this important area of mathematics, drawing on the latest research and insights from across the field.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.