This manual provides an introduction to comparative philology, which is the study of the similarities and differences between languages. The focus of the manual is on using the principles of comparative philology to better understand the inflections (changes in form) of Greek and Latin words. The manual was first published in 1879 and was intended for use by students of classics and ancient history. 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.